Bump bootstrap

Bumps bootstrap from 4.0.0 to 4.3.1.

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

Author: dependabot[bot]

build-info-extractor-nuget/src/test/resources/org/jfrog/build/extractor/packagesconfig/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="bootstrap" version="4.0.0" targetFramework="net461" />
+  <package id="bootstrap" version="4.3.1" targetFramework="net461" />
   <package id="jQuery" version="3.0.0" targetFramework="net461" />
   <package id="Microsoft.Web.Xdt" version="2.1.1" targetFramework="net461" />
   <package id="Newtonsoft.Json" version="11.0.2" targetFramework="net461" />