Bump pybind11 version to 2.13.6 (#101)

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
index c7b4ceb..cfb0974 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -1,7 +1,7 @@
 # Bazel extensions for pybind11
 module(
     name = "pybind11_bazel",
-    version = "2.13.1",
+    version = "2.13.6",
 )
 
 bazel_dep(name = "bazel_skylib", version = "1.7.1")