Bump org.webjars:bootstrap from 3.3.7 to 3.4.0

Bumps [org.webjars:bootstrap](https://github.com/webjars/bootstrap) from 3.3.7 to 3.4.0.
- [Commits](webjars/bootstrap@bootstrap-3.3.7...bootstrap-3.4.0)

---
updated-dependencies:
- dependency-name: org.webjars:bootstrap
  dependency-type: direct:production
...

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

pom.xml

@@ -119,7 +119,7 @@
         <dependency>
             <groupId>org.webjars</groupId>
             <artifactId>bootstrap</artifactId>
-            <version>3.3.7</version>
+            <version>3.4.0</version>
         </dependency>
         <dependency>
             <groupId>org.webjars</groupId>