gh-39654: Pybind11, version 2.13.6
    
version bump needed for scipy update

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [x] I have created tests covering the changes.
- [x] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - #12345: short description why this is a dependency -->
<!-- - #34567: ... -->
    
URL: #39654
Reported by: Dima Pasechnik
Reviewer(s): David Coudert

Author: Release Manager

build/pkgs/pybind11/checksums.ini

@@ -1,4 +1,4 @@
-tarball=pybind11-VERSION.tar.gz
-sha1=3c75333a9056f0be18eb612803cd46a2bb0c87fc
-sha256=00cd59116a6e8155aecd9174f37ba299d1d397ed4a6b86ac1dfe01b3e40f2cc4
-upstream_url=https://files.pythonhosted.org/packages/source/p/pybind11/pybind11-VERSION.tar.gz
+tarball=pybind11-VERSION-py3-none-any.whl
+sha1=3d927e0ba37bd0af47cd14ec2b52eb796d412806
+sha256=237c41e29157b962835d356b370ededd57594a26d5894a795960f0047cb5caf5
+upstream_url=https://pypi.io/packages/py3/p/pybind11/pybind11-VERSION-py3-none-any.whl

build/pkgs/pybind11/package-version.txt

@@ -1 +1 @@
-2.11.1
+2.13.6

build/pkgs/pybind11/spkg-install.in

@@ -1 +1,2 @@
-pybind11 >=2.6
+pybind11>=2.13.2,<2.14.0
+# see https://github.com/scipy/scipy/blob/maintenance/1.15.x/pyproject.toml