deps: update dependency com.google.http-client:google-http-client-bom to v1.38.1 (#358)

Author: renovate-bot

java-core/pom.xml

@@ -157,7 +157,7 @@
     <google.iam.version>1.0.5</google.iam.version>
     <google.auth.version>0.22.2</google.auth.version>
     <google.api.version>1.31.1</google.api.version>
-    <google.http.version>1.38.0</google.http.version>
+    <google.http.version>1.38.1</google.http.version>
     <grpc.version>1.34.1</grpc.version>
     <protobuf.version>3.14.0</protobuf.version>
     <opencensus.version>0.24.0</opencensus.version>