Bump bootstrap4-api from 4.5.3-2 to 4.6.0-1

Bumps [bootstrap4-api](https://github.com/jenkinsci/bootstrap4-api-plugin) from 4.5.3-2 to 4.6.0-1.
- [Release notes](https://github.com/jenkinsci/bootstrap4-api-plugin/releases)
- [Changelog](https://github.com/jenkinsci/bootstrap4-api-plugin/blob/master/CHANGELOG.md)
- [Commits](jenkinsci/bootstrap4-api-plugin@v4.5.3-2...v4.6.0-1)

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

Author: dependabot[bot]

pom.xml

@@ -30,7 +30,7 @@
 
     <jquery3-api.version>3.5.1-2</jquery3-api.version>
     <font-awesome-api.version>5.15.2-1</font-awesome-api.version>
-    <bootstrap4-api.version>4.5.3-2</bootstrap4-api.version>
+    <bootstrap4-api.version>4.6.0-1</bootstrap4-api.version>
     <plugin-util-api.version>1.6.1</plugin-util-api.version>
 
     <commons.lang.version>3.9</commons.lang.version>