ci: bump the github-actions group across 1 directory with 2 updates

Bumps the github-actions group with 2 updates in the / directory: [docker/build-push-action](https://github.com/docker/build-push-action) and [vlaurin/action-ghcr-prune](https://github.com/vlaurin/action-ghcr-prune).


Updates `docker/build-push-action` from 5 to 6
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

Updates `vlaurin/action-ghcr-prune` from 0.5.0 to 0.6.0
- [Release notes](https://github.com/vlaurin/action-ghcr-prune/releases)
- [Commits](vlaurin/action-ghcr-prune@v0.5.0...v0.6.0)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: vlaurin/action-ghcr-prune
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/docker.yml

@@ -72,7 +72,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: "Rebuild ghcr.io/oasisprotocol/oasis-core-dev:${{ steps.determine_tag.outputs.tag }}"
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: docker/oasis-core-dev
           file: docker/oasis-core-dev/Dockerfile
@@ -86,7 +86,7 @@ jobs:
             org.opencontainers.image.revision=${{ github.sha }}
 
       - name: "Rebuild ghcr.io/oasisprotocol/oasis-core-ci:${{ steps.determine_tag.outputs.tag }}"
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: docker/oasis-core-ci
           file: docker/oasis-core-ci/Dockerfile
@@ -101,7 +101,7 @@ jobs:
             org.opencontainers.image.revision=${{ github.sha }}
 
       - name: "Rebuild ghcr.io/oasisprotocol/aesmd-dcap:${{ steps.determine_tag.outputs.tag }}"
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: docker/aesmd
           file: docker/aesmd/Dockerfile
@@ -116,7 +116,7 @@ jobs:
             org.opencontainers.image.revision=${{ github.sha }}
 
       - name: "Rebuild ghcr.io/oasisprotocol/aesmd-epid:${{ steps.determine_tag.outputs.tag }}"
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: docker/aesmd
           file: docker/aesmd/Dockerfile
@@ -131,7 +131,7 @@ jobs:
             org.opencontainers.image.revision=${{ github.sha }}
 
       - name: Prune old ghcr.io/oasisprotocol/oasis-core-dev images
-        uses: vlaurin/action-ghcr-prune@v0.5.0
+        uses: vlaurin/action-ghcr-prune@v0.6.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           organization: oasisprotocol
@@ -142,7 +142,7 @@ jobs:
           prune-tags-regexes: ^pr-
 
       - name: Prune old ghcr.io/oasisprotocol/oasis-core-ci images
-        uses: vlaurin/action-ghcr-prune@v0.5.0
+        uses: vlaurin/action-ghcr-prune@v0.6.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           organization: oasisprotocol
@@ -153,7 +153,7 @@ jobs:
           prune-tags-regexes: ^pr-
 
       - name: Prune old ghcr.io/oasisprotocol/aesmd-dcap images
-        uses: vlaurin/action-ghcr-prune@v0.5.0
+        uses: vlaurin/action-ghcr-prune@v0.6.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           organization: oasisprotocol
@@ -164,7 +164,7 @@ jobs:
           prune-tags-regexes: ^pr-
 
       - name: Prune old ghcr.io/oasisprotocol/aesmd-epid images
-        uses: vlaurin/action-ghcr-prune@v0.5.0
+        uses: vlaurin/action-ghcr-prune@v0.6.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           organization: oasisprotocol