python3: 3.10 -> 3.11

Updates the default python version to 3.11, while keeping 3.10 around
until after the NixOS 23.11 release.

pkgs/development/interpreters/python/default.nix

@@ -127,7 +127,7 @@ in {
     enableOptimizations = false;
     enableLTO = false;
     mimetypesSupport = false;
-  } // sources.python310)).overrideAttrs(old: {
+  } // sources.python311)).overrideAttrs(old: {
     # TODO(@Artturin): Add this to the main cpython expr
     strictDeps = true;
     pname = "python3-minimal";

pkgs/top-level/all-packages.nix

@@ -18045,11 +18045,11 @@ with pkgs;
   # available as `pythonPackages.tkinter` and can be used as any other Python package.
   # When switching these sets, please update docs at ../../doc/languages-frameworks/python.md
   python2 = python27;
-  python3 = python310;
+  python3 = python311;
 
   # pythonPackages further below, but assigned here because they need to be in sync
   python2Packages = dontRecurseIntoAttrs python27Packages;
-  python3Packages = dontRecurseIntoAttrs python310Packages;
+  python3Packages = dontRecurseIntoAttrs python311Packages;
 
   pypy = pypy2;
   pypy2 = pypy27;