Remove python3.9 from CI tests

[NoureldinYosri]

first step towards dropping py3.9 in cirq1.4 #6463

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.76%. Comparing base (dc1065d) to head (758ba16).

❗ Current head 758ba16 differs from pull request most recent head 526e70f. Consider uploading reports for the commit 526e70f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6495      +/-   ##
==========================================
- Coverage   97.76%   97.76%   -0.01%     
==========================================
  Files        1105     1105              
  Lines       94999    95030      +31     
==========================================
+ Hits        92873    92902      +29     
- Misses       2126     2128       +2     

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[pavoljuhas]

Is everyone OK with removing the CI status checks for 3.9 (Python Ubuntu (3.9) etc.) in the repo settings now?
I can do so tomorrow unless there are objections.

[pavoljuhas]

@NoureldinYosri - there are few more places that I think can be bumped to 3.10 now, see below. Otherwise, LGTM.

.github/workflows/release-main.yml:18:          python-version: '3.9'
asv.conf.json:11:    "pythons": ["3.9"],
docs/dev/development.md:97:    Make sure you have python 3.9 or greater.
docs/start/install.md:15:Cirq currently supports python 3.9 and later.
docs/start/install.md:23:0. Make sure you have python 3.9.0 or greater.
docs/start/install.md:90:0. Make sure you have python 3.9.0 or greater.
docs/start/install.md:157:1. Make sure you have python 3.9.0 or greater.
release.md:85:System requirements: Linux, python3.9

[NoureldinYosri]

@pavoljuhas I updated the requested files, ptal

[NoureldinYosri]

@pavoljuhas I changed the branch protection rule to be for 3.10 rather than 3.9

[pavoljuhas]

@pavoljuhas I changed the branch protection rule to be for 3.10 rather than 3.9

Did the same right now. Can you please push an empty commit to restart the CI?

[pavoljuhas]

Found one leftover at

Cirq/docs/dev/development.md

Line 97 in 758ba16

Make sure you have python 3.9 or greater.

Otherwise it is good to go.