build(deps): bump the ci group across 1 directory with 3 updates

Bumps the ci group with 3 updates in the / directory: [actions/checkout](https://github.com/actions/checkout), [helm/kind-action](https://github.com/helm/kind-action) and [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer).


Updates `actions/checkout` from 5 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

Updates `helm/kind-action` from 1.12.0 to 1.13.0
- [Release notes](https://github.com/helm/kind-action/releases)
- [Commits](helm/kind-action@v1.12.0...v1.13.0)

Updates `sigstore/cosign-installer` from 3.10.0 to 4.0.0
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@v3.10.0...v4.0.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ci
- dependency-name: helm/kind-action
  dependency-version: 1.13.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: ci
- dependency-name: sigstore/cosign-installer
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ci
...

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

Author: dependabot[bot]

.github/workflows/build.yaml

@@ -19,7 +19,7 @@ jobs:
       labels: ubuntu-latest-16-cores
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup Go
         uses: actions/setup-go@v6
         with:

.github/workflows/e2e.yaml

@@ -38,16 +38,16 @@ jobs:
           - knative
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup Kubernetes
-        uses: helm/kind-action@v1.12.0
+        uses: helm/kind-action@v1.13.0
         if: matrix.provider != 'skipper'
         with:
           version: v0.23.0
           cluster_name: kind
           node_image: kindest/node:v1.30.0@sha256:047357ac0cfea04663786a612ba1eaba9702bef25227a794b52890dd8bcd692e
       - name: Setup Kubernetes for skipper
-        uses: helm/kind-action@v1.12.0
+        uses: helm/kind-action@v1.13.0
         if: matrix.provider == 'skipper'
         with:
           version: v0.23.0

.github/workflows/helm.yaml

@@ -12,7 +12,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Publish Helm charts
         uses: stefanprodan/[email protected]
         with:

.github/workflows/push-ld.yml

@@ -16,8 +16,8 @@ jobs:
       id-token: write
       packages: write
     steps:
-      - uses: actions/checkout@v5
-      - uses: sigstore/cosign-installer@v3.10.0
+      - uses: actions/checkout@v6
+      - uses: sigstore/cosign-installer@v4.0.0
       - name: Prepare
         id: prep
         run: |

.github/workflows/release.yml

@@ -27,13 +27,13 @@ jobs:
       id-token: write # needed for keyless signing
       packages: write # needed for ghcr access
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Go
         uses: actions/setup-go@v6
         with:
           go-version: 1.25.x
       - uses: fluxcd/flux2/action@main
-      - uses: sigstore/cosign-installer@v3.10.0
+      - uses: sigstore/cosign-installer@v4.0.0
       - name: Prepare
         id: prep
         run: |

.github/workflows/scan.yml

@@ -17,7 +17,7 @@ jobs:
     permissions:
       security-events: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Run FOSSA scan and upload build data
         uses: fossa-contrib/fossa-action@v3
         with:
@@ -30,7 +30,7 @@ jobs:
       security-events: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup Go
         uses: actions/setup-go@v6
         with: