deps: update dependency io.grpc:grpc-context to v1.68.2 (googleapis#2038)

Author: renovate-bot

pom.xml

@@ -258,7 +258,7 @@
       <dependency>
         <groupId>io.grpc</groupId>
         <artifactId>grpc-context</artifactId>
-        <version>1.66.0</version>
+        <version>1.68.2</version>
       </dependency>
       <dependency>
         <groupId>io.opencensus</groupId>