Bump the github-actions group across 1 directory with 2 updates

Bumps the github-actions group with 2 updates in the / directory: [actions/upload-artifact](https://github.com/actions/upload-artifact) and [lkstrp/pypsa-validator](https://github.com/lkstrp/pypsa-validator).


Updates `actions/upload-artifact` from 3.2.1.pre.node20 to 4.4.1
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3.2.1-node20...v4.4.1)

Updates `lkstrp/pypsa-validator` from 0.2.2 to 0.2.3
- [Release notes](https://github.com/lkstrp/pypsa-validator/releases)
- [Commits](lkstrp/pypsa-validator@v0.2.2...v0.2.3)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: lkstrp/pypsa-validator
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

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

.github/workflows/test.yaml

@@ -99,7 +99,7 @@ jobs:
         make test
 
     - name: Upload artifacts
-      uses: actions/upload-artifact@v3.2.1-node20
+      uses: actions/upload-artifact@v4.4.1
       with:
         name: logs-${{ matrix.inhouse }}
         path: |
@@ -180,7 +180,7 @@ jobs:
 
     - name: Upload artifacts
       if: env.pinned == 'false'
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v4.4.1
       with:
         name: logs-${{ matrix.inhouse }}
         path: |

.github/workflows/validate.yaml

@@ -16,7 +16,7 @@ jobs:
     if: github.event.pull_request.head.repo.full_name == github.repository
     runs-on: self-hosted
     steps:
-    - uses: lkstrp/pypsa-validator@v0.2.2
+    - uses: lkstrp/pypsa-validator@v0.2.3
       with:
         step: run-self-hosted-validation
         env_file: envs/environment.yaml
@@ -30,7 +30,7 @@ jobs:
     needs: run-validation
     runs-on: ubuntu-latest
     steps:
-    - uses: lkstrp/pypsa-validator@v0.2.2
+    - uses: lkstrp/pypsa-validator@v0.2.3
       with:
         step: create-comment
         snakemake_config: config/test/config.validator.yaml