Fix Read the Docs, do not install simsimd

Author: pquentin

.readthedocs.yml

@@ -7,7 +7,7 @@ build:
     # to set AIOHTTP_NO_EXTENSIONS to 1 but it has to be done in
     # https://readthedocs.org/dashboard/elasticsearch-py/environmentvariables/
     # because of https://github.com/readthedocs/readthedocs.org/issues/6311
-    python: "3.13"
+    python: "3.12"
 
 python:
   install:

pyproject.toml

@@ -70,7 +70,7 @@ dev = [
     "nox",
     "orjson",
     "numpy",
-    "simsimd",
+    "simsimd ; python_version<'3.13'",
     "pyarrow",
     "pandas",
     "mapbox-vector-tile",