Bump envoyproxy/toolshed from actions-v0.4.5 to 0.4.6 (#1519)

Bumps [envoyproxy/toolshed](https://github.com/envoyproxy/toolshed) from actions-v0.4.5 to 0.4.6. This release includes the previously tagged commit.
- [Release notes](https://github.com/envoyproxy/toolshed/releases)
- [Commits](envoyproxy/toolshed@actions-v0.4.5...actions-v0.4.6)

---
updated-dependencies:
- dependency-name: envoyproxy/toolshed
  dependency-version: 0.4.6
  dependency-type: direct:production
...

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Author: dependabot[bot]

.github/workflows/_ci.yml

@@ -47,7 +47,7 @@ jobs:
         echo "common --jobs=200" >> repo.bazelrc
         echo "build --config=bes" >> repo.bazelrc
     - name: Bind mount spare disk for build artifacts
-      uses: envoyproxy/toolshed/actions/bind-mounts@actions-v0.4.5
+      uses: envoyproxy/toolshed/actions/bind-mounts@actions-v0.4.6
       with:
         mounts: |
           - src: /mnt/envoy-docker-build