ENH: Update minimum versions supported to 3.9

Update documentation to only include valid python versions.

Author: hjmjohnson

docs/Build_ITK_Python_packages.rst

@@ -21,7 +21,7 @@ automated. The following sections outline how to use the associated scripts.
 Linux
 -----
 
-On any linux distribution with docker and bash installed, running the script dockcross-manylinux-build-wheels.sh will create 64-bit wheels for both python 2.x and python 3.x in the dist directory.
+On any linux distribution with docker and bash installed, running the script dockcross-manylinux-build-wheels.sh will create 64-bit wheels for python 3.9+ in the dist directory.
 
 For example::
 

scripts/macpython-download-cache-and-build-module-wheels.sh

@@ -10,7 +10,7 @@
 # Versions can be restricted by passing them in as arguments to the script.
 # For example,
 #
-#   scripts/macpython-build-module-wheels.sh 3.7 3.9
+#   scripts/macpython-build-module-wheels.sh 3.9 3.11
 # Shared libraries can be included in the wheel by exporting them to DYLD_LIBRARY_PATH before
 # running this script.
 #

scripts/pyproject.toml.in

@@ -39,7 +39,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Medical Science Apps.",
     "Topic :: Software Development :: Libraries",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     @PYPROJECT_DEPENDENCIES@
 ]