* pipx and pipx_info: Document that modules require pipx 0.16.2.1 or above
Since their introduction, these modules rely on 'pipx list --json' to
return machine-readable output about installed pipx applications. That
functionality was introduced in 0.16.2, along with a critical bug fix
(invalid json) in 0.16.2.1.
* pipx: fix state=latest with install_deps=true
"pipx upgrade" stopped supporting the "--include-deps" option
("install_deps" in the ansible module) in pipx 0.15
(https://pypa.github.io/pipx/changelog/#01500).
The lack of support causes the pipx module to fail if attempting to use
state=latest with install_deps, since the parameter is passed to both
pipx install (fine) and pipx upgrade (fails).
* Add changelog fragment
