ci: fix create-release input (target_commitish -> commitish) (#2866)

actions/create-release@v1's input is `commitish`, not `target_commitish`, so
the value was silently ignored ("Unexpected input(s) 'target_commitish'") and
release tags were created against the repo default branch (master) instead of
the built ref. This put 5.42.1-beta.1's tag on master's HEAD rather than the
emergency-release commit it was built from. Use the correct key so beta/prod
release tags point at the actual built commit.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: piyalbasu

.github/workflows/submitBeta.yml

@@ -129,7 +129,7 @@ jobs:
             github.event.inputs.version }}
           draft: false
           prerelease: true
-          target_commitish: ${{ steps.checkout_sha.outputs.sha }}
+          commitish: ${{ steps.checkout_sha.outputs.sha }}
       - name: Upload Release Asset
         id: upload-release-asset
         uses: actions/upload-release-asset@v1

.github/workflows/submitProduction.yml

@@ -102,7 +102,7 @@ jobs:
           body: ${{ steps.package_version.outputs.version }}
           draft: false
           prerelease: false
-          target_commitish: ${{ steps.checkout_sha.outputs.sha }}
+          commitish: ${{ steps.checkout_sha.outputs.sha }}
       - name: Build for Firefox
         id: web-ext-build
         uses: kewisch/action-web-ext@fe10addf5d5e5ba6b78ffde720dd488a27d10e8c #v1