Bump webfactory/ssh-agent from 0.7.0 to 0.8.0

Bumps [webfactory/ssh-agent](https://github.com/webfactory/ssh-agent) from 0.7.0 to 0.8.0.
- [Release notes](https://github.com/webfactory/ssh-agent/releases)
- [Changelog](https://github.com/webfactory/ssh-agent/blob/master/CHANGELOG.md)
- [Commits](webfactory/ssh-agent@v0.7.0...v0.8.0)

---
updated-dependencies:
- dependency-name: webfactory/ssh-agent
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/macos.yaml

@@ -15,7 +15,7 @@ jobs:
         with:
           xcode-version: latest-stable
       - name: "Set SSH key"
-        uses: webfactory/ssh-agent@v0.7.0
+        uses: webfactory/ssh-agent@v0.8.0
         with:
             ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}
       - name: "Carthage Cached Bootstrap"