Bump bootswatch from 4.5.3 to 4.6.0

Bumps [bootswatch](https://github.com/thomaspark/bootswatch) from 4.5.3 to 4.6.0.
- [Release notes](https://github.com/thomaspark/bootswatch/releases)
- [Commits](https://github.com/thomaspark/bootswatch/compare/v4.5.3...v4.6.0)

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

package.json

@@ -4,7 +4,7 @@
     "@rails/webpacker": "^5.2.1",
     "@sentry/browser": "^6.0.0",
     "bootstrap": "^4.6.0",
-    "bootswatch": "^4.5.3",
+    "bootswatch": "^4.6.0",
     "chosen-js": "^1.8.7",
     "d3": "^6.3.1",
     "d3-tip": "^0.9.1",