Bump GitHub actions versions

ChangeLog:

	* .github/workflows/Clang.yml:
	* .github/workflows/GCC.yml:
	* .github/workflows/fair-software.yml:
	* .github/workflows/reuse.yml:

Author: mattkretz

.github/workflows/Clang.yml

@@ -22,7 +22,7 @@ jobs:
       image: ghcr.io/mattkretz/cplusplus-ci/clang${{ matrix.version }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Run test suite
         env:

.github/workflows/GCC.yml

@@ -22,7 +22,7 @@ jobs:
       image: ghcr.io/mattkretz/cplusplus-ci/gcc${{ matrix.version }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Run test suite
         env:

.github/workflows/fair-software.yml

@@ -12,7 +12,7 @@ jobs:
     name: "fair-software"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           repository: mattkretz/howfairis
           path: howfairis

.github/workflows/reuse.yml

@@ -8,6 +8,6 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: REUSE Compliance Check
-        uses: fsfe/reuse-action@v5
+        uses: fsfe/reuse-action@v6