flake: Use nixpkgs 24.11

nixpkgs 24.11 changes how we access xonsh yet again
and updates clang.

Unfortunately, clang 18 produces significantly more
warnings on existing code that is challenging to fix.
Make sure that doesn't error when we're running
`-Werror` builds.

n.b. I had to change the "SSL certificate problem: self-signed
certificate" to the old error prior to the improved libcurl errors,
since what is presumably a difference in which TLS library is used has
cropped up between releases? Either way the curl error buffer is empty.
Seems like we aggressively cannot do anything about this.

Change-Id: If0141a46a8b445a0e7d6f86f939e8c8e03569bf5

flake.lock

@@ -34,16 +34,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1727184566,
-        "narHash": "sha256-mgdK8BcFsLSNhe780+cHbEUbZ3OruLa1T/xgQlL4Aj4=",
+        "lastModified": 1733348545,
+        "narHash": "sha256-b4JrUmqT0vFNx42aEN9LTWOHomkTKL/ayLopflVf81U=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "48c3030083c46042584531bc9d931020f1975677",
+        "rev": "9ecb50d2fae8680be74c08bb0a995c5383747f89",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-24.05-small",
+        "ref": "nixos-24.11-small",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -67,11 +67,11 @@
     "pre-commit-hooks": {
       "flake": false,
       "locked": {
-        "lastModified": 1726745158,
-        "narHash": "sha256-D5AegvGoEjt4rkKedmxlSEmC+nNLMBPWFxvmYnVLhjk=",
+        "lastModified": 1733318908,
+        "narHash": "sha256-SVQVsbafSM1dJ4fpgyBqLZ+Lft+jcQuMtEL3lQWx2Sk=",
         "owner": "cachix",
         "repo": "git-hooks.nix",
-        "rev": "4e743a6920eab45e8ba0fbe49dc459f1423a4b74",
+        "rev": "6f4e2a2112050951a314d2733a994fbab94864c6",
         "type": "github"
       },
       "original": {