[9.4] fix(deps): pin oauthlib to 4.0.0 for oauthlib 3.3.1 CVE batch (#4552) (#4557)

Backports the following commits to 9.4:
 - fix(deps): pin oauthlib to 4.0.0 for oauthlib 3.3.1 CVE batch (#4552)

Co-authored-by: Jan-Kazlouski-elastic <jan.kazlouski@elastic.co>

Author: github-actions[bot]

app/connectors_service/pyproject.toml

@@ -51,6 +51,7 @@ dependencies = [
     "lxml==6.1.0",
     "msal==1.37.0",
     "notion-client==2.2.1",
+    "oauthlib==4.0.0",
     "oracledb==2.3.0",
     "pip-licenses==5.5.5",
     "protobuf==5.29.6",