deps: exclude un-used runtime dependencies brought in by gax-grpc (#1490)

Fixes b/216195517 Exclude: ``` io.grpc:grpc-xds:jar:1.42.1:runtime io.grpc:grpc-services:jar:1.42.1:runtime com.google.re2j:re2j:jar:1.5:runtime org.bouncycastle:bcprov-jdk15on:jar:1.67:runtime io.opencensus:opencensus-proto:0.2.0:runtime ```

Author: stephaniewang526

google-cloud-bigquerystorage/pom.xml

@@ -95,6 +95,28 @@
  <dependency>
  <groupId>com.google.api</groupId>
  <artifactId>gax-grpc</artifactId>
+ <exclusions>
+ <exclusion>
+ <groupId>io.grpc</groupId>
+ <artifactId>grpc-xds</artifactId>
+ </exclusion>
+ <exclusion>
+ <groupId>io.grpc</groupId>
+ <artifactId>grpc-services</artifactId>
+ </exclusion>
+ <exclusion>
+ <groupId>com.google.re2j</groupId>
+ <artifactId>re2j</artifactId>
+ </exclusion>
+ <exclusion>
+ <groupId>org.bouncycastle</groupId>
+ <artifactId>bcprov-jdk15on</artifactId>
+ </exclusion>
+ <exclusion>
+ <groupId>io.opencensus</groupId>
+ <artifactId>opencensus-proto</artifactId>
+ </exclusion>
+ </exclusions>
  </dependency>
  <dependency>
  <groupId>org.threeten</groupId>