chore: add maryliag as CODEOWNER of opentelemetry-instrumentation-pg (#2052)

Add `maryliag` as CODEOWNER of `plugins/node/opentelemetry-instrumentation-pg` as discussed on SIG meeting of March 27.

Signed-off-by: maryliag <[email protected]>

Author: maryliag

.github/component_owners.yml

@@ -111,6 +111,7 @@ components:
   plugins/node/opentelemetry-instrumentation-runtime-node:
     - d4nyll
   plugins/node/opentelemetry-instrumentation-pg:
+    - maryliag
     - rauno56
   plugins/node/opentelemetry-instrumentation-pino:
     - seemk