chore: update dependency pg to ^8.15.6

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

extensions/sequelize/package.json

@@ -57,7 +57,7 @@
     "@loopback/testlab": "^7.0.12",
     "@types/node": "^16.18.126",
     "oracledb": "^6.8.0",
-    "pg": "^8.14.1",
+    "pg": "^8.15.6",
     "pg-hstore": "^2.3.4",
     "sqlite3": "5.1.7",
     "typescript": "~5.2.2"