chore(deps): bump docker/setup-buildx-action from 3 to 4

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 3 to 4.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v3...v4)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/Build-Test-And-Deploy.yml

@@ -54,7 +54,7 @@ jobs:
         run: dotnet test --no-build --configuration Release
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
 # Build but no push with a PR
       - name: Docker build (no push)

.github/workflows/PR-Build-And-Test.yml

@@ -52,7 +52,7 @@ jobs:
           output-directory: '${{ runner.temp }}/vsplaylists'
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Build Container Image
         uses: docker/build-push-action@v6

.github/workflows/copilot-setup-steps.yml

@@ -50,7 +50,7 @@ jobs:
         run: dotnet test --no-build --configuration Release
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Set up Node.js for frontend development
         uses: actions/setup-node@v6