ci: bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

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

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -47,7 +47,7 @@ jobs:
         source ../contrib/fedora/bashrc_sssd
         make -j$PROCESSORS distcheck
 
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       if: always()
       with:
         name: build

.github/workflows/ci.yml

@@ -70,7 +70,7 @@ jobs:
 
     - name: Upload main artifacts
       if: always()
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         if-no-files-found: ignore
         name: ${{ matrix.tag }}-intgcheck
@@ -86,7 +86,7 @@ jobs:
 
     - name: Upload valgrind artifacts
       if: always()
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         if-no-files-found: ignore
         name: ${{ matrix.tag }}-intgcheck-valgrind
@@ -320,7 +320,7 @@ jobs:
 
     - name: Upload artifacts
       if: always()
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         if-no-files-found: ignore
         name: ${{ matrix.tag }}-system

.github/workflows/static-code-analysis.yml

@@ -39,7 +39,7 @@ jobs:
         make -j$PROCESSORS
 
     - name: Upload configuration artifacts
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       if: always()
       with:
         name: codeql-build