Bump bootstrap

Bumps bootstrap from 3.0.0 to 3.4.1.

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

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

samples/xamarin/UserItems/ResourceTokenBroker/ResourceTokenBroker/packages.config

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Antlr" version="3.4.1.9004" targetFramework="net452" />
-  <package id="bootstrap" version="3.0.0" targetFramework="net452" />
+  <package id="bootstrap" version="3.4.1" targetFramework="net452" />
   <package id="EntityFramework" version="6.1.3" targetFramework="net452" />
   <package id="jQuery" version="1.10.2" targetFramework="net452" />
   <package id="jQuery.Validation" version="1.11.1" targetFramework="net452" />