Bump actions/upload-artifact from 6 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/deploy_beta_testing.yml

@@ -36,7 +36,7 @@ jobs:
         run: echo "war_file=$(ls *.war | head -1)">> $GITHUB_ENV
 
       - name: Upload war artifact
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: built-app
           path: ./target/${{ env.war_file }}

.github/workflows/maven_unit_test.yml

@@ -62,7 +62,7 @@ jobs:
 
           # Upload the built war file. For download, it will be wrapped in a ZIP by GitHub.
           # See also https://github.com/actions/upload-artifact#zipped-artifact-downloads
-          - uses: actions/upload-artifact@v6
+          - uses: actions/upload-artifact@v7
             with:
                 name: dataverse-java${{ matrix.jdk }}.war
                 path: target/dataverse*.war
@@ -72,7 +72,7 @@ jobs:
           - run: |
                 tar -cvf java-builddir.tar target
                 tar -cvf java-m2-selection.tar ~/.m2/repository/io/gdcc/dataverse-*
-          - uses: actions/upload-artifact@v6
+          - uses: actions/upload-artifact@v7
             with:
                 name: java-artifacts
                 path: |
@@ -124,7 +124,7 @@ jobs:
 
             # Wrap up and send to coverage job
             - run: tar -cvf java-reportdir.tar target/site
-            - uses: actions/upload-artifact@v6
+            - uses: actions/upload-artifact@v7
               with:
                   name: java-reportdir
                   path: java-reportdir.tar