Bump docker/build-push-action from 2 to 3 (#899)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 3.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v2...v3)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/docker_build_kanidm.yml

@@ -37,7 +37,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push kanidmd
         id: docker_build_kanidm
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v3
         with:
           push: ${{ github.ref == 'refs/heads/master' }}
           platforms: ${{matrix.target}}

.github/workflows/docker_build_kanidmd.yml

@@ -37,7 +37,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push kanidmd
         id: docker_build_kanidmd
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v3
         with:
           push: ${{ github.ref == 'refs/heads/master' }}
           platforms: ${{matrix.target}}

.github/workflows/docker_build_radiusd.yml

@@ -35,7 +35,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push radius
         id: docker_build_radius
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v3
         with:
           push: ${{ github.ref == 'refs/heads/master' }}
           platforms: ${{matrix.target}}