ci: add plpgsql-parser and plpgsql-deparser to test matrix

Both packages have tests that should be run in CI:
- plpgsql-deparser: comprehensive round-trip tests for 190 fixtures
- plpgsql-parser: return-info extraction tests

Author: pyramation

.github/workflows/run-tests.yaml

@@ -12,6 +12,8 @@ jobs:
         package:
           - deparser
           - parser
+          - plpgsql-deparser
+          - plpgsql-parser
           - pgsql-cli
           - proto-parser
           - transform
@@ -39,4 +41,4 @@ jobs:
         run: pnpm build
 
       - name: test
-        run: pnpm --filter ${{ matrix.package }} test
+        run: pnpm --filter ${{ matrix.package }} test