Bump the github-actions group with 2 updates (#398)

Author: dependabot[bot]

.github/workflows/build-ultraplot.yml

@@ -98,7 +98,7 @@ jobs:
       # Return the html output of the comparison even if failed
       - name: Upload comparison failures
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: failed-comparisons-${{ inputs.python-version }}-${{ inputs.matplotlib-version }}-${{ github.sha }}
           path: results/*

.github/workflows/publish-pypi.yml

@@ -54,7 +54,7 @@ jobs:
         shell: bash
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: dist-${{ github.sha }}-${{ github.run_id }}-${{ github.run_number }}
           path: dist/*
@@ -73,7 +73,7 @@ jobs:
       contents: read
     steps:
       - name: Download artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: dist-${{ github.sha }}-${{ github.run_id }}-${{ github.run_number }}
           path: dist
@@ -105,7 +105,7 @@ jobs:
       contents: read
     steps:
       - name: Download artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: dist-${{ github.sha }}-${{ github.run_id }}-${{ github.run_number }}
           path: dist