build(deps-dev): bump @0x/sol-coverage from 3.0.12 to 4.0.8

Bumps [@0x/sol-coverage](https://github.com/0xProject/0x-monorepo) from 3.0.12 to 4.0.8.
- [Release notes](https://github.com/0xProject/0x-monorepo/releases)
- [Commits](https://github.com/0xProject/0x-monorepo/compare/@0x/sol-coverage@3.0.12...@0x/sol-coverage@4.0.8)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

packages/protocol/package.json

@@ -16,7 +16,7 @@
     "openzeppelin-solidity": "^2.4.0"
   },
   "devDependencies": {
-    "@0x/sol-coverage": "^3.0.0",
+    "@0x/sol-coverage": "^4.0.8",
     "@0x/sol-profiler": "^3.1.2",
     "@0x/sol-trace": "^2.0.8",
     "@0x/subproviders": "^5.0.1",