Fix Netty version conflict by upgrading o11yphant to 1.9.2 (#2511)

This commit resolves a Netty version conflict that was causing the warning:
"NoClassDefFoundError: io/netty/util/internal/ClassInitializerUtil"

The issue was caused by multiple Netty versions in the dependency tree:
- Datastax Cassandra driver (3.11.3) brought in Netty 4.1.77.Final
- grpc-netty (1.35.0) brought in Netty 4.1.52.Final

This conflict prevented Netty from loading its native epoll transport,
causing it to fall back to NIO with a warning message.

Solution:
- Upgraded o11yphant from 1.9.1 to 1.9.2
  - Version 1.9.2 removed the grpc-netty dependency from o11yphant-trace-otel
- Removed direct grpc-netty dependency from embedder module

This is a cleaner solution than forcing Netty version alignment via BOM,
as it eliminates the conflicting dependency entirely.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <[email protected]>

Author: ruhan1

embedder/pom.xml

@@ -34,10 +34,6 @@
   </properties>
 
   <dependencies>
-    <dependency>
-      <groupId>io.grpc</groupId>
-      <artifactId>grpc-netty</artifactId>
-    </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>

pom.xml

@@ -98,7 +98,7 @@
     <cassandraUnitVersion>3.7.1.0</cassandraUnitVersion>
     <datastaxVersion>3.11.3</datastaxVersion>
     <pathmappedStorageVersion>3.0</pathmappedStorageVersion>
-    <o11yphantVersion>1.9.1</o11yphantVersion>
+    <o11yphantVersion>1.9.2</o11yphantVersion>
     <swaggerVersion>1.6.6</swaggerVersion>
     <agroalVersion>1.16</agroalVersion>
     <groovyVersion>3.0.13</groovyVersion>