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

@@ -92,7 +92,7 @@ jobs:
         run: cargo mutants --no-times --timeout 300 --in-place -- --lib
         continue-on-error: true
       - name: Upload mutation results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: mutation-results
           path: mutants.out/

.github/workflows/nightly.yml

@@ -168,7 +168,7 @@ jobs:
 
       - name: Upload artifact (unix)
         if: runner.os != 'Windows'
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02  # v4.6.2
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
         with:
           name: apr-${{ matrix.target }}
           path: |
@@ -177,7 +177,7 @@ jobs:
 
       - name: Upload artifact (windows)
         if: runner.os == 'Windows'
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02  # v4.6.2
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
         with:
           name: apr-${{ matrix.target }}
           path: |