Bump IdentityModel from 5.0.0 to 5.1.0 (DuendeArchive#137)

Bumps [IdentityModel](https://github.com/IdentityModel/IdentityModel) from 5.0.0 to 5.1.0.
- [Release notes](https://github.com/IdentityModel/IdentityModel/releases)
- [Commits](DuendeArchive/IdentityModel@5.0.0...5.1.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

src/IdentityModel.AspNetCore.OAuth2Introspection.csproj

@@ -35,7 +35,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="IdentityModel" Version="5.0.0" />
+    <PackageReference Include="IdentityModel" Version="5.1.0" />
 
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
     <PackageReference Include="minver" Version="2.5.0" PrivateAssets="All" />