Update patch to Python 3.12.6.

Also includes updates to:
- XZ 5.6.2
- OpenSSL 3.0.15

Makefile

@@ -18,7 +18,7 @@ BUILD_NUMBER=custom
 # of a release cycle, as official binaries won't be published.
 # PYTHON_MICRO_VERSION is the full version number, without any alpha/beta/rc suffix. (e.g., 3.10.0)
 # PYTHON_VER is the major/minor version (e.g., 3.10)
-PYTHON_VERSION=3.12.4
+PYTHON_VERSION=3.12.6
 PYTHON_PKG_VERSION=$(PYTHON_VERSION)
 PYTHON_MICRO_VERSION=$(shell echo $(PYTHON_VERSION) | grep -Eo "\d+\.\d+\.\d+")
 PYTHON_PKG_MICRO_VERSION=$(shell echo $(PYTHON_PKG_VERSION) | grep -Eo "\d+\.\d+\.\d+")

README.rst

@@ -4,7 +4,7 @@ Python Apple Support
 This is a meta-package for building a version of Python that can be embedded
 into a macOS, iOS, tvOS or watchOS project.
 
-**This branch builds a packaged version of Python 3.12.0**.
+**This branch builds a packaged version of Python 3.12.6**.
 Other Python versions are available by cloning other branches of the main
 repository: