chore(deps): bump the nuget group (#2345)

Bumps the nuget group in /src/Agent/NewRelic/Agent/Core with 1 update: [Google.Protobuf](https://github.com/protocolbuffers/protobuf).


Updates `Google.Protobuf` from 3.25.3 to 3.26.0
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.25.3...v3.26.0)

---
updated-dependencies:
- dependency-name: Google.Protobuf
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: nuget
...

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

src/Agent/NewRelic/Agent/Core/Core.csproj

@@ -37,7 +37,7 @@
 
   <ItemGroup>
     <PackageReference Include="Autofac" Version="4.5.0" />
-    <PackageReference Include="Google.Protobuf" Version="3.25.3" />
+    <PackageReference Include="Google.Protobuf" Version="3.26.0" />
     <PackageReference Include="Grpc.Tools" Version="2.62.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>