Revert "python39: 3.9.6 -> 3.9.7"

This reverts commit d003f75d7888cd92993107b5a1d6e3a8d340bf68.

Causes an unnecessary amount of breakages due to a DeprecationWarning
regarding the loop argument in asyncio, that is going to be deprecrated
in Python 3.10.

> 'The loop argument is deprecated since Python 3.8, and scheduled for removal in Python 3.10.'

The ecosystem needs more time to catch up here. Broken packages are for
example aiohttp, argh and by extension alot of other packages.

1 files changed, 2 insertions, 2 deletions

diff --git a/pkgs/development/interpreters/python/default.nix b/pkgs/development/interpreters/python/default.nix
index d497d493ef9..471320ee2c1 100644
--- a/pkgs/development/interpreters/python/default.nix
+++ b/pkgs/development/interpreters/python/default.nix
@@ -132,10 +132,10 @@ with pkgs;
       sourceVersion = {
         major = "3";
         minor = "9";
-        patch = "7";
+        patch = "6";
         suffix = "";
       };
-      sha256 = "0mrwbsdrdfrj8k1ap0cm6pw8h0rrhxivg6b338fh804cwqb5c57q";
+      sha256 = "12hhw2685i68pwfx5hdkqngzhbji4ccyjmqb5rzvkigg6fpj0y9r";
     };
   };