fix: Update the requirements.txt for samples directory

Author: mukund-ananthu

samples/snippets/requirements.txt

@@ -1,8 +1,8 @@
-google-cloud-pubsub==2.23.0
+google-cloud-pubsub==2.25.0
 avro==1.12.0
 protobuf===4.24.4; python_version == '3.7'
 protobuf==5.28.0; python_version >= '3.8'
 avro==1.12.0
-opentelemetry-api==1.22.0
-opentelemetry-sdk==1.22.0
-opentelemetry-exporter-gcp-trace==1.7.0
+opentelemetry-api==1.27.0
+opentelemetry-sdk==1.27.0
+opentelemetry-exporter-gcp-trace==1.7.0