build(deps): Bump envoyproxy/toolshed from actions-v0.0.18 to 0.1.2 (#810)

Bumps [envoyproxy/toolshed](https://github.com/envoyproxy/toolshed) from actions-v0.0.18 to 0.1.2. This release includes the previously tagged commit.
- [Release notes](https://github.com/envoyproxy/toolshed/releases)
- [Commits](envoyproxy/toolshed@actions-v0.0.18...actions-v0.1.2)

---
updated-dependencies:
- dependency-name: envoyproxy/toolshed
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/envoy-sync.yaml

@@ -22,7 +22,7 @@ jobs:
       }}
     steps:
     - id: appauth
-      uses: envoyproxy/toolshed/gh-actions/appauth@actions-v0.0.18
+      uses: envoyproxy/toolshed/gh-actions/appauth@actions-v0.1.2
       with:
         key: ${{ secrets.ENVOY_CI_UPDATE_BOT_KEY }}
         app_id: ${{ secrets.ENVOY_CI_UPDATE_APP_ID }}