docs(components): Bump the python version to 3.8

Signed-off-by: Googler <nobody@google.com>
PiperOrigin-RevId: 632325315

Author: Googler

components/google-cloud/docs/.readthedocs.yml

@@ -11,4 +11,4 @@ python:
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.7"
+    python: "3.8"