add package-lock to codeowners (Azure#49472)

Author: JoshLove-msft

.github/CODEOWNERS

@@ -1116,6 +1116,7 @@
 
 # Add owners for emitter version changes
 /eng/http-client-csharp-emitter-package.json                       @JoshLove-msft @m-nash @jorgerangel-msft @live1206 @ArcturusZhang @nisha-bhatia
+/eng/http-client-csharp-emitter-package-lock.json                  @JoshLove-msft @m-nash @jorgerangel-msft @live1206 @ArcturusZhang @nisha-bhatia
 
 # ######## Code Generation ########