Bump version to 1.2.3 and update CHANGELOG

[systemcatch]

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• [ ] 🧪 Added tests for changed code.
• [ ] 🛠️ All tests pass when run locally (run tox or make test to find out!).
• [ ] 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• [ ] 📚 Updated documentation for changed code.
• [ ] ⏩ Code is up-to-date with the master branch.

If you have any questions about your code changes or any of the points above, please submit your questions along with the pull request and we will try our best to help!

Description of Changes

[codecov[bot]]

Codecov Report

Merging #1116 (fcc0630) into master (dc6428f) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1116   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines         2325      2325           
  Branches       449       449           
=========================================
  Hits          2325      2325           

Impacted Files	Coverage Δ
arrow/_version.py	100.00% <100.00%> (ø)

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[cyriaka90]

Hello :) The newest version is still not available here: https://github.com/arrow-py/arrow/releases / https://pypi.org/project/arrow/#history Is that on purpose?

[anishnya]

@cyriaka90 no. Both I and @krisfremen don't have access to push tags to PyPi. We (hopefully) plan on pushing the tags out this week.

[cyriaka90]

Ah, okay! Didn't know that. Thanks - and no pressure! :)