Bump actions/upload-artifact from 6 to 7 (#586)

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

Author: dependabot[bot]

.github/workflows/pkgdown.yaml

@@ -48,7 +48,7 @@ jobs:
         shell: Rscript {0}
 
       - name: Upload website
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: website
           retention-days: 5

.github/workflows/render-readme.yaml

@@ -43,7 +43,7 @@ jobs:
         shell: Rscript {0}
 
       - name: Upload README.md as an artifact
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: readme
           path: README.md

.github/workflows/test-coverage.yaml

@@ -65,7 +65,7 @@ jobs:
 
       - name: Upload test results
         if: failure()
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: coverage-test-failures
           path: ${{ runner.temp }}/package