Bump pybind version to 2.13.1 (#97)

diff --git a/MODULE.bazel b/MODULE.bazel
index 6ad2b33..b855cca 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -1,7 +1,7 @@
 # Bazel extensions for pybind11
 module(
     name = "pybind11_bazel",
-    version = "2.12.0",
+    version = "2.13.1",
 )
 
 bazel_dep(name = "bazel_skylib", version = "1.7.1")