build(deps): bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/gh-package.yml

@@ -15,7 +15,7 @@ jobs:
       packages: write
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Java
         uses: actions/setup-java@v3

.github/workflows/maven.yml

@@ -25,12 +25,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         path: nom-tam-fits
 
     - name: Check out blackbox images 
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: nom-tam-fits/blackbox-images
         path: blackbox-images
@@ -90,7 +90,7 @@ jobs:
 
     steps:
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Java for Publishing to Nexus
       uses: actions/setup-java@v3

.github/workflows/site.yml

@@ -26,12 +26,12 @@ jobs:
 
     steps:
     - name: Checkout master
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         path: nom-tam-fits
 
     - name: Checkout gh-pages
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: 'gh-pages'
         path: site