Bump bootstrap (#410)

Bumps bootstrap from 4.0.0 to 4.3.1.

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Diff for: build-info-extractor-nuget/src/test/resources/org/jfrog/build/extractor/reference/reference.csproj

@@ -18,7 +18,7 @@
   </ItemGroup>
     <ItemGroup>
         <PackageReference Include="bootstrap">
-            <Version>4.0.0</Version>
+            <Version>4.3.1</Version>
         </PackageReference>
         <PackageReference Include="Newtonsoft.Json">
             <Version>11.0.2</Version>