build(deps): bump the actions-updates group across 1 directory with 4 updates (#162)

Bumps the actions-updates group with 4 updates in the / directory: [step-security/harden-runner](https://github.com/step-security/harden-runner), [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer), [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) and [actions/cache](https://github.com/actions/cache).


Updates `step-security/harden-runner` from 2.15.0 to 2.16.0
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@a90bcbc...fa2e9d6)

Updates `sigstore/cosign-installer` from 4.0.0 to 4.1.0
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@faadad0...ba7bc0a)

Updates `docker/setup-buildx-action` from 3.12.0 to 4.0.0
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@8d2750c...4d04d5d)

Updates `actions/cache` from 5.0.3 to 5.0.4
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@cdf6c1f...6682284)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.16.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions-updates
- dependency-name: sigstore/cosign-installer
  dependency-version: 4.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions-updates
- dependency-name: docker/setup-buildx-action
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions-updates
- dependency-name: actions/cache
  dependency-version: 5.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions-updates
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ben Leggett <benjamin@edera.io>

Author: dependabot[bot]

.github/workflows/matrix.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Harden the runner (Audit all outbound calls)
-      uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
+      uses: step-security/harden-runner@fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594 # v2.16.0
       with:
         egress-policy: audit
 
@@ -62,7 +62,7 @@ jobs:
       KERNEL_ARCHITECTURES: "${{ join(matrix.builds.architectures, ',') }}"
     steps:
       - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
+        uses: step-security/harden-runner@fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594 # v2.16.0
         with:
           egress-policy: audit
 
@@ -71,11 +71,11 @@ jobs:
         with:
           submodules: recursive
       - name: install cosign
-        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
+        uses: sigstore/cosign-installer@ba7bc0a3fef59531c69a25acd34668d6d3fe6f22 # v4.1.0
       - name: docker setup linux-kernel-oci
         run: sudo python3 ./hack/build/docker-setup.py
       - name: docker setup buildx
-        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3
+        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4.0.0
       - name: docker login ghcr.io
         uses: Wandalen/wretry.action@e68c23e6309f2871ca8ae4763e7629b9c258e1ea # v3.8.0
         with:
@@ -85,7 +85,7 @@ jobs:
             username: "${{github.actor}}"
             password: "${{secrets.GITHUB_TOKEN}}"
       - name: restore ccache
-        uses: actions/cache/restore@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.2
+        uses: actions/cache/restore@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.2
         with:
           path: ~/.cache/kernel-ccache
           # restore-keys is important here - it lets us restore the most recent cache key,
@@ -105,7 +105,7 @@ jobs:
       - name: run docker script
         run: sh -x docker.sh
       - name: save ccache
-        uses: actions/cache/save@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.2
+        uses: actions/cache/save@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.2
         with:
           path: ~/.cache/kernel-ccache
           # The run_id here is just for write-key uniqueness, as GH doesn't allow overwriting