Add googleclientauth extension to release manifest (#577)

Author: damemi

distributions/otelcol-contrib/manifest.yaml

@@ -18,6 +18,7 @@ extensions:
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding/jsonlogencodingextension v0.102.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding/otlpencodingextension v0.102.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding/zipkinencodingextension v0.102.0
+  - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/googleclientauthextension v0.102.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/headerssetterextension v0.102.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/healthcheckextension v0.102.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/httpforwarderextension v0.102.0