fix: Update CODEOWNERS for aws-serverless-mcp-server

Replace @aws/aws-lambda-tooling team handle with individual GitHub
usernames as code owners for the serverless MCP server.

Author: bnusunny

.github/CODEOWNERS

@@ -44,7 +44,7 @@ NOTICE                                                         @awslabs/mcp-admi
 /src/aws-msk-mcp-server                                        @awslabs/mcp-admins @awslabs/mcp-maintainers  @dingyiheng @mehbey @isaurab007
 /src/aws-network-mcp-server                                    @awslabs/mcp-admins @awslabs/mcp-maintainers  @juhala-aws @NetDevAutomate
 /src/aws-pricing-mcp-server                                    @awslabs/mcp-admins @awslabs/mcp-maintainers  @nspring00 @aytech-in @s12v
-/src/aws-serverless-mcp-server                                 @awslabs/mcp-admins @awslabs/mcp-maintainers  @bx9900
+/src/aws-serverless-mcp-server                                 @awslabs/mcp-admins @awslabs/mcp-maintainers  @bx9900 @bnusunny @reedham-aws @roger-zhangg @valerena @Vandita2020 @seshubaws @vicheey @tobixlea @licjun
 /src/aws-support-mcp-server                                    @awslabs/mcp-admins @awslabs/mcp-maintainers  @Wook133
 /src/bedrock-kb-retrieval-mcp-server                           @awslabs/mcp-admins @awslabs/mcp-maintainers  @theagenticguy @pranjbh
 /src/billing-cost-management-mcp-server                        @awslabs/mcp-admins @awslabs/mcp-maintainers  @chittev @Rahul-1404 @shsrams