Fix pendulum.parse('now', tz='...') ignoring the time zone

[pR0Ps]

Pull Request Check List

• Added tests for changed code.
• Updated documentation for changed code (nothing to update - as far as I can tell this isn't mentioned in it).

Previously, using "now" with pendulum.parse short-circuited all other parsing logic (expected), including the time zone (not expected).

Example using the latest release:

>>> import pendulum
>>> pendulum.__version__
'2.1.2'
>>> pendulum.parse("2023-04-04", tz="America/Los_Angeles").format("z (Z)")
'America/Los_Angeles (-07:00)'
>>> pendulum.parse("now", tz="America/Los_Angeles").format("z (Z)")
'Etc/UTC (-00:00)'

The same example after this PR:

>>> import pendulum
>>> pendulum.__version__
'3.0.0a'
>>> pendulum.parse("2023-04-04", tz="America/Los_Angeles").format("z (Z)")
'America/Los_Angeles (-07:00)'
>>> pendulum.parse("now", tz="America/Los_Angeles").format("z (Z)")
'America/Los_Angeles (-07:00)'

[codspeed-hq]

CodSpeed Performance Report

Merging #701 will not alter performance

_{Comparing pR0Ps:bugfix/parse-now-timezone (3313f1b) with master (3e3fec6)}

Summary

✅ 1 untouched benchmarks

[pR0Ps]

@edgarrmondragon Anything else for me to do on this?

[edgarrmondragon]

@edgarrmondragon Anything else for me to do on this?

I'll preface saying I'm not a maintainer of this repo, so my approval is only nominal 🙂.

This LGTM, there's a Rust linting error but I don't know if it's related to changes in this PR.