chore(deps): bump actions/upload-pages-artifact from 1 to 2 (#65)

Bumps [actions/upload-pages-artifact](https://github.com/actions/upload-pages-artifact) from 1 to 2.
- [Release notes](https://github.com/actions/upload-pages-artifact/releases)
- [Commits](actions/upload-pages-artifact@v1...v2)

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

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

.github/workflows/docs.yml

@@ -45,7 +45,7 @@ jobs:
             --transform-for-static-hosting \
             --hosting-base-path WMATAUI.swift
       - name: Upload artifact 📜
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v2
         with:
           # Upload docs directory
           path: .build/plugins/Swift-DocC/outputs/WMATAUI.doccarchive