Update docker/metadata-action action to v5.6.1 (#2785)

| datasource  | package                | from   | to     |
| ----------- | ---------------------- | ------ | ------ |
| github-tags | docker/metadata-action | v5.5.1 | v5.6.1 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -99,7 +99,7 @@ jobs:
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         with:
           context: ${{ inputs.tag != '' && 'git' || 'workflow' }}
           images: |

.github/workflows/conformance.yml

@@ -48,7 +48,7 @@ jobs:
 
       - name: NGF Docker meta
         id: ngf-meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         with:
           images: |
             name=ghcr.io/nginxinc/nginx-gateway-fabric
@@ -61,7 +61,7 @@ jobs:
 
       - name: NGINX Docker meta
         id: nginx-meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         with:
           images: |
             name=ghcr.io/nginxinc/nginx-gateway-fabric/${{ inputs.image == 'plus' && 'nginx-plus' || inputs.image }}

.github/workflows/functional.yml

@@ -43,7 +43,7 @@ jobs:
 
       - name: NGF Docker meta
         id: ngf-meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         with:
           images: |
             name=ghcr.io/nginxinc/nginx-gateway-fabric
@@ -56,7 +56,7 @@ jobs:
 
       - name: NGINX Docker meta
         id: nginx-meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         with:
           images: |
             name=ghcr.io/nginxinc/nginx-gateway-fabric/${{ inputs.image == 'plus' && 'nginx-plus' || inputs.image }}

.github/workflows/helm.yml

@@ -35,7 +35,7 @@ jobs:
 
       - name: NGF Docker meta
         id: ngf-meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         with:
           images: |
             name=ghcr.io/nginxinc/nginx-gateway-fabric
@@ -48,7 +48,7 @@ jobs:
 
       - name: NGINX Docker meta
         id: nginx-meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         with:
           images: |
             name=ghcr.io/nginxinc/nginx-gateway-fabric/${{ inputs.image == 'plus' && 'nginx-plus' || inputs.image }}