Bump the actions group in /.github/workflows with 2 updates

Bumps the actions group in /.github/workflows with 2 updates: [actions/checkout](https://github.com/actions/checkout) and [OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml](https://github.com/openastronomy/github-actions-workflows).


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 `OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml` from 2.3.0 to 2.3.1
- [Release notes](https://github.com/openastronomy/github-actions-workflows/releases)
- [Commits](OpenAstronomy/github-actions-workflows@d9b81a0...9f1fedd)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml
  dependency-version: 2.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/ci_workflows.yml

@@ -57,7 +57,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         submodules: true
@@ -100,7 +100,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         submodules: true
@@ -125,7 +125,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         submodules: true

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
 
   build_and_publish:
 
-    uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml@d9b81a07e789d1b1921ab5fe33de2ddcbbd02c3f  # v2.3.0
+    uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml@9f1fedda61294df4c004c05519a3fbf3b8e1f32f  # v2.3.1
     if: (github.repository == 'liberfa/pyerfa')
     with: