ci: bump actions/upload-artifact from 4 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...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/ci.yml

@@ -98,7 +98,7 @@ jobs:
       # that's when you most want to eyeball the rendered output.
       - name: Upload rendered snapshots
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: snapshots
           path: artifacts/test-results/snapshots/
@@ -107,7 +107,7 @@ jobs:
 
       - name: Upload test results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: test-results
           path: TestResults/

.github/workflows/release-gate.yml

@@ -138,7 +138,7 @@ jobs:
 
       - name: Upload Inkscape PNGs
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: inkscape-exports
           path: inkscape-exports/
@@ -147,7 +147,7 @@ jobs:
 
       - name: Upload source SVGs
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: source-svgs
           path: artifacts/test-results/snapshots/