python3: bump version to 3.9.5

Refreshed Python patches.
Updated pip & setuptools version.

For pip, patch '001-pep517-pyc-fix.patch' was reworked.

Also, the current version of the bundled pip (21.1.1) no longer supports
Python2, so the 'py2.py3' suffix gets replaced with just py3.

For setuptools, there is no longer a script/module:
  https://github.com/pypa/setuptools/pull/2544

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
(cherry picked from commit e312275dd9)

lang/python/python3/patches/014-remove-platform-so-suffix.patch

@@ -1,6 +1,6 @@
 --- a/configure
 +++ b/configure
-@@ -15366,7 +15366,7 @@ $as_echo_n "checking ABIFLAGS... " >&6;
+@@ -15371,7 +15371,7 @@ $as_echo_n "checking ABIFLAGS... " >&6;
  $as_echo "$ABIFLAGS" >&6; }
  { $as_echo "$as_me:${as_lineno-$LINENO}: checking SOABI" >&5
  $as_echo_n "checking SOABI... " >&6; }
@@ -11,7 +11,7 @@
  
 --- a/configure.ac
 +++ b/configure.ac
-@@ -4777,7 +4777,7 @@ AC_SUBST(SOABI)
+@@ -4781,7 +4781,7 @@ AC_SUBST(SOABI)
  AC_MSG_CHECKING(ABIFLAGS)
  AC_MSG_RESULT($ABIFLAGS)
  AC_MSG_CHECKING(SOABI)