Update vpython3 requests

Updates the requests version in .vpython3 to the latest available in
order to pick up a security fix. Also changes the requested version to
the Python 3-only one since Python 2 support was removed from requests.

Also adds a dependency that the new version requires.

Bug: chromium:1448265
Change-Id: Ie712cf0fc8f67464155866ae000ffb248ce30971
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/307420
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40202}
diff --git a/.vpython3 b/.vpython3
index 96feab5..3f571df 100644
--- a/.vpython3
+++ b/.vpython3
@@ -83,8 +83,28 @@
   version: "version:3.20.0"
 >
 wheel: <
-  name: "infra/python/wheels/requests-py2_py3"
-  version: "version:2.13.0"
+  name: "infra/python/wheels/requests-py3"
+  version: "version:2.31.0"
+>
+wheel: <
+  name: "infra/python/wheels/idna-py2_py3"
+  version: "version:2.8"
+>
+wheel: <
+  name: "infra/python/wheels/urllib3-py2_py3"
+  version: "version:1.26.6"
+>
+wheel: <
+  name: "infra/python/wheels/certifi-py2_py3"
+  version: "version:2020.11.8"
+>
+wheel: <
+  name: "infra/python/wheels/charset_normalizer-py3"
+  version: "version:2.0.4"
+>
+wheel: <
+  name: "infra/python/wheels/brotli/${vpython_platform}"
+  version: "version:1.0.9"
 >
 
 # Used by: