Bump actions/upload-artifact from 5 to 6 (#3109)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/deploy_branch.yml

@@ -28,7 +28,7 @@ jobs:
         scripts/buildSdist.sh
 
     - name: "Upload artifact: sdist"
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: sdist
         path: python/sdist/dist/amici-*.gz

.github/workflows/test_benchmark_collection_models.yml

@@ -85,7 +85,7 @@ jobs:
       run: |
           python3 tests/benchmark_models/evaluate_benchmark.py
 
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       with:
         name: computation-times-${{ matrix.python-version }}-${{ matrix.extract_subexpressions }}
         path: |

.github/workflows/test_performance.yml

@@ -55,7 +55,7 @@ jobs:
         AMICI_IMPORT_NPROCS=2 check_time.sh petab_import python tests/performance/test.py import
 
     - name: "Upload artifact: CS_Signalling_ERBB_RAS_AKT_petab"
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: model_performance_test
         path: model_performance_test

.github/workflows/test_sbml_semantic_test_suite.yml

@@ -47,7 +47,7 @@ jobs:
     - run: AMICI_PARALLEL_COMPILE="" ./scripts/run-SBMLTestsuite.sh ${{ matrix.cases }}
 
     - name: "Upload artifact: SBML semantic test suite results"
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: amici-semantic-results-${{ matrix.cases }}
         path: tests/sbml/amici-semantic-results

.github/workflows/test_sbml_semantic_test_suite_jax.yml

@@ -45,7 +45,7 @@ jobs:
     - run: ./scripts/run-SBMLTestsuite.sh --jax ${{ matrix.cases }}
 
     - name: "Upload artifact: SBML semantic test suite results"
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: amici-semantic-results-jax-${{ matrix.cases }}
         path: tests/sbml/amici-semantic-results-jax