ceph: switch python from 3.10 to 3.11

Some of the dependencies wouldn't build anymore:
https://hydra.nixos.org/build/257585236/nixlog/5/tail

Tested on x86_64-linux:
ceph ceph-client ceph-csi ceph-dev ceph.tests

pkgs/tools/filesystems/ceph/default.nix

@@ -41,7 +41,7 @@
 , lz4
 , oath-toolkit
 , openldap
-, python310
+, python311
 , rdkafka
 , rocksdb
 , snappy
@@ -168,7 +168,7 @@ let
   };
 
   # Watch out for python <> boost compatibility
-  python = python310.override {
+  python = python311.override {
     packageOverrides = self: super: let
       cryptographyOverrideVersion = "40.0.1";
       bcryptOverrideVersion = "4.0.1";