build(deps): bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/bleeding.yml

@@ -48,7 +48,7 @@ jobs:
         shell: bash
         if: failure()
       - name: Upload screenshots
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: "end2end-screenshots-${{ steps.info.outputs.date }}-${{ steps.info.outputs.sha_short }}-${{ matrix.image }}"
           path: |

.github/workflows/ci.yml

@@ -121,7 +121,7 @@ jobs:
         shell: bash
         if: failure()
       - name: Upload screenshots
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: "end2end-screenshots-${{ steps.info.outputs.date }}-${{ steps.info.outputs.sha_short }}-${{ matrix.image }}"
           path: |
@@ -269,7 +269,7 @@ jobs:
         shell: bash
         if: failure()
       - name: Upload screenshots
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: "end2end-screenshots-${{ steps.info.outputs.date }}-${{ steps.info.outputs.sha_short }}-${{ matrix.testenv }}-${{ matrix.os }}"
           path: |

.github/workflows/nightly.yml

@@ -72,7 +72,7 @@ jobs:
             echo "sha_short=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"
         shell: bash
       - name: Upload artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: "qutebrowser-nightly-${{ steps.info.outputs.date }}-${{ steps.info.outputs.sha_short }}-${{ matrix.name }}"
           path: |