Fix CI: update pnpm-lock.yaml for electron 40.6.0 → 40.8.4 (#2126)

Dependabot bumped `electron` to `40.8.4` in
`ts/packages/shell/package.json` but did not regenerate
`ts/pnpm-lock.yaml`, causing `pnpm install --frozen-lockfile` to fail in
CI with `ERR_PNPM_OUTDATED_LOCKFILE`.

## Changes

- **`ts/pnpm-lock.yaml`**: Regenerated via `pnpm install
--no-frozen-lockfile` to align the lockfile's electron specifier
(`40.6.0` → `40.8.4`) with `packages/shell/package.json`

> [!WARNING]
>
> <details>
> <summary>Firewall rules blocked me from connecting to one or more
addresses (expand for details)</summary>
>
> #### I tried to connect to the following addresses, but was blocked by
firewall rules:
>
> - `www.electronjs.org`
> - Triggering command: `/opt/hostedtoolcache/node/24.14.0/x64/bin/node
/opt/hostedtoolcache/node/24.14.0/x64/bin/node
/home/REDACTED/work/TypeAgent/TypeAgent/ts/node_modules/.pnpm/@electron&#43;rebuild@4.0.3/node_modules/@electron/rebuild/lib/module-type/node-gyp/worker.js`
(dns block)
>
> If you need me to access, download, or install something from one of
these locations, you can either:
>
> - Configure [Actions setup
steps](https://gh.io/copilot/actions-setup-steps) to set up my
environment, which run before the firewall is enabled
> - Add the appropriate URLs or hosts to the custom allowlist in this
repository's [Copilot coding agent
settings](https://github.com/microsoft/TypeAgent/settings/copilot/coding_agent)
(admins only)
>
> </details>

<!-- START COPILOT CODING AGENT SUFFIX -->



<!-- START COPILOT ORIGINAL PROMPT -->



<details>

<summary>Original prompt</summary>

> Fix the failing GitHub Actions workflow build_package_shell
(macos-latest, 22)
> Analyze the workflow logs, identify the root cause of the failure, and
implement a fix.
> Check run ID: 69799281248
> Job URL:
https://github.com/microsoft/TypeAgent/actions/runs/23931502972/job/69799281248


</details>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: robgruen <25374553+robgruen@users.noreply.github.com>

Author: Copilot