switch default py3 version to 3.11 and rm old py3.x versions

lang/python/3/files/CHANGES.OpenBSD

@@ -0,0 +1,29 @@
+As required by item 3 of the PSF license, here is a brief summary
+of changes made to this version of Python for the OpenBSD package.
+
+1.  OpenBSD packages require that sonames are under control of the
+ports infrastructure, configure.ac was patched to do this.
+
+2.  Conditionally enable modern hashes according to their availability.
+
+3.  Disable libuuid, otherwise Python prefers it over the libc uuid
+functions.
+
+4.  Disable MULTIARCH check in configure.ac since OpenBSD is not a
+multi-arch platform and it causes build problems.
+
+5.  Allow Python to build with LTO on OpenBSD clang architectures.
+OpenBSD's version of llvm-ar is installed as /usr/bin/ar, and the
+compiler as passed to ports builds is /usr/bin/cc.
+
+6.  Use closefrom(2) instead of looping through all the file descriptors
+and calling close(2) on them.
+
+7.  ctypes' find_library is modified to pass "libc.so" to dlopen() rather
+than attempting to resolve a version number by parsing ldconfig -r output,
+which results in loading an incorrect version in some cases.
+
+8.  Adjust #ifdef to use LibreSSL's version of X509_STORE_get1_objects().
+
+These changes are available in the OpenBSD CVS repository
+<http://www.openbsd.org/anoncvs.html> in ports/lang/python/3.

lang/python/3/files/EXTERNALLY-MANAGED

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+[externally-managed]
+Error=This Python installation is managed by pkg_add(1).
+
+ To install Python packages system-wide, use the OS packages where
+ possible, for example: "pkg_add py3-somepackage".
+
+ Otherwise, for software which is not available in packages,
+ it is recommended to create a "venv" (virtual environment, see
+ https://docs.python.org/3/library/venv.html) and install it there.
+ For standalone applications, pipx (in the py3-pipx package) can
+ help manage this for you.