Bump azure/bicep from 0.17.1 to 0.20.4

Bumps [azure/bicep](https://github.com/azure/bicep) from 0.17.1 to 0.20.4.
- [Release notes](https://github.com/azure/bicep/releases)
- [Changelog](https://github.com/Azure/bicep/blob/main/docs/release-checklist.md)
- [Commits](Azure/bicep@v0.17.1...v0.20.4)

---
updated-dependencies:
- dependency-name: azure/bicep
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/dependabot_hack.yml

@@ -13,6 +13,6 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       # Dockerfile:
-      - uses: azure/bicep@v0.17.1
+      - uses: azure/bicep@v0.20.4
       - uses: azure/azure-cli@azure-cli-2.48.1
       - uses: pre-commit/pre-commit@v3.4.0