Bump actions/checkout from 3 to 6 (#86)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -47,7 +47,7 @@ jobs:
 
     steps:
       - name: Checkout (GitHub)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
@@ -99,7 +99,7 @@ jobs:
 
     steps:
       - name: Checkout (GitHub)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3

.github/workflows/release.yaml

@@ -41,7 +41,7 @@ jobs:
 
     steps:
       - name: Checkout (GitHub)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
@@ -90,7 +90,7 @@ jobs:
 
     steps:
       - name: Checkout (GitHub)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3