Bump gh-pages from 2.2.0 to 3.1.0 (#160)

Bumps [gh-pages](https://github.com/tschaub/gh-pages) from 2.2.0 to 3.1.0.
- [Release notes](https://github.com/tschaub/gh-pages/releases)
- [Changelog](https://github.com/tschaub/gh-pages/blob/main/changelog.md)
- [Commits](tschaub/gh-pages@v2.2.0...v3.1.0)

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

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

package.json

@@ -20,7 +20,7 @@
     "@statisticsnorway/ssb-component-library": "^2.0.40",
     "bootstrap": "^4.6.0",
     "core-js": "^3.9.1",
-    "gh-pages": "^2.2.0",
+    "gh-pages": "^3.1.0",
     "history": "^4.10.1",
     "prismjs": "^1.23.0",
     "prop-types": "^15.7.2",