Changelog:
============
-Add support for Python 3.9 through 3.12, drop support for 3.7
-Removal of dependency on six module
-Raise explicit exception when deserializing a vector with a subtype that
isn’t a constant size
-Remove outdated Python pre-3.7 references
-Remove backup(.bak) files
-Fix doc typo in add_callbacks
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
