Bump Microsoft.AspNetCore.Authentication.JwtBearer from 8.0.20 to 8.0.21 (#49)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.Authentication.JwtBearer
  dependency-version: 8.0.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

sources/ShowcaseApp/ShowcaseApp.csproj

@@ -10,7 +10,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.20" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.21" />
     <PackageReference Include="NSwag.AspNetCore" Version="14.6.1" />
   </ItemGroup>
 </Project>