chore(deps): Bump the nuget-agent group with 1 update (#3445)

Bumps Grpc.Tools from 2.76.0 to 2.78.0

---
updated-dependencies:
- dependency-name: Grpc.Tools
  dependency-version: 2.78.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: nuget-agent
...

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

Author: dependabot[bot]

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

@@ -41,7 +41,7 @@
     <!-- Autofac v6+ doesn't support framework. We could possibly upgrade to v5.x but there's no compelling reason for it. -->
     <PackageReference Include="Autofac" Version="[4.5.0]" />
     <PackageReference Include="Google.Protobuf" Version="3.33.5" />
-    <PackageReference Include="Grpc.Tools" Version="2.76.0">
+    <PackageReference Include="Grpc.Tools" Version="2.78.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>