build(deps): bump yup from 0.28.5 to 0.29.1

Bumps [yup](https://github.com/jquense/yup) from 0.28.5 to 0.29.1.
- [Release notes](https://github.com/jquense/yup/releases)
- [Changelog](https://github.com/jquense/yup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jquense/yup/compare/v0.28.5...v0.29.1)

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

packages/config-loader/package.json

@@ -33,7 +33,7 @@
     "@backstage/config": "^0.1.1-alpha.12",
     "fs-extra": "^9.0.0",
     "yaml": "^1.9.2",
-    "yup": "^0.28.5"
+    "yup": "^0.29.1"
   },
   "devDependencies": {
     "@types/jest": "^25.2.2",