Add supported python version to gcp integration (#5614)

* Add supported python version to gcp integration

* Update src/platforms/python/guides/gcp-functions/index.mdx

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

Author: rodolfoBee

src/platforms/python/guides/gcp-functions/index.mdx

@@ -13,6 +13,12 @@ Add the Sentry SDK to your `requirements.txt`:
  sentry-sdk>=0.17.1
 ```
 
+<Note>
+
+The GCP integration currently supports only the Python `3.7` runtime environment. If you try to run it with a newer version (such as `3.9`), an error message will be displayed (with debug mode on). 
+
+</Note>
+
 ## Configure
 
 You can use the Google Cloud Functions integration for the Python SDK like this: