fix: use env markers for anesthetic — exact pin on 3.12, relaxed on 3.13

anesthetic==2.8.14 works on 3.12 but requires numpy<2.0.0 which is
incompatible with 3.13. Use environment markers to keep the exact
pin on 3.12 while allowing >=2.9.0 (numpy 2.x compatible) on 3.13.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

pyproject.toml

@@ -25,7 +25,8 @@ keywords = ["cli"]
 dependencies = [
     "autoconf",
     "array_api_compat",
-    "anesthetic>=2.8.14",
+    "anesthetic==2.8.14; python_version < '3.13'",
+    "anesthetic>=2.9.0; python_version >= '3.13'",
     "corner==2.2.2",
     "decorator>=4.2.1",
     "dill>=0.3.1.1",