remove deprecated Pool.get

[Nothing4You]

What do these changes do?

Deprecated method Pool.get was removed

Are there changes in behavior for the user?

Yes, see above.

Related issue number

no

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment to CHANGES.txt

[codecov]

Codecov Report

Merging #706 (798e7fd) into master (eb7250f) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #706      +/-   ##
==========================================
- Coverage   92.72%   92.62%   -0.11%     
==========================================
  Files          38       38              
  Lines        5570     5560      -10     
  Branches      944      941       -3     
==========================================
- Hits         5165     5150      -15     
- Misses        317      322       +5     
  Partials       88       88              

Flag	Coverage Δ
ubuntu-latest_3.10_mariadb-10.3	89.13% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.10_mariadb-10.4	89.13% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.10_mariadb-10.5	89.11% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.10_mariadb-10.6	89.11% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.10_mariadb-10.7	89.11% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.10_mariadb-10.8	89.11% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.10_mysql-5.7	89.82% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.10_mysql-8.0	91.20% <94.44%> (-0.15%)	⬇️
ubuntu-latest_3.11-dev_mariadb-10.3	89.10% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.11-dev_mariadb-10.4	89.10% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.11-dev_mariadb-10.5	89.08% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.11-dev_mariadb-10.6	89.08% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.11-dev_mariadb-10.7	89.08% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.11-dev_mariadb-10.8	89.08% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.11-dev_mysql-5.7	89.78% <72.22%> (-0.15%)	⬇️
ubuntu-latest_3.11-dev_mysql-8.0	91.16% <94.44%> (-0.15%)	⬇️
ubuntu-latest_3.7_mariadb-10.3	88.52% <77.77%> (-0.16%)	⬇️
ubuntu-latest_3.7_mariadb-10.4	88.52% <77.77%> (-0.16%)	⬇️
ubuntu-latest_3.7_mariadb-10.5	88.50% <77.77%> (-0.16%)	⬇️
ubuntu-latest_3.7_mariadb-10.6	88.50% <77.77%> (-0.16%)	⬇️
ubuntu-latest_3.7_mariadb-10.7	88.50% <77.77%> (-0.16%)	⬇️
ubuntu-latest_3.7_mariadb-10.8	88.50% <77.77%> (-0.16%)	⬇️
ubuntu-latest_3.7_mysql-5.7	89.25% <77.77%> (-0.16%)	⬇️
ubuntu-latest_3.7_mysql-8.0	90.75% <100.00%> (-0.12%)	⬇️
ubuntu-latest_3.8_mariadb-10.3	89.17% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.8_mariadb-10.4	89.17% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.8_mariadb-10.5	89.15% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.8_mariadb-10.6	89.15% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.8_mariadb-10.7	89.15% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.8_mariadb-10.8	89.15% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.8_mysql-5.7	89.86% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.8_mysql-8.0	91.22% <100.00%> (-0.15%)	⬇️
ubuntu-latest_3.9_mariadb-10.3	89.03% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.9_mariadb-10.4	89.03% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.9_mariadb-10.5	89.01% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.9_mariadb-10.6	89.01% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.9_mariadb-10.7	89.01% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.9_mariadb-10.8	89.01% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.9_mysql-5.7	89.71% <77.77%> (-0.15%)	⬇️
ubuntu-latest_3.9_mysql-8.0	91.08% <100.00%> (-0.15%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiomysql/pool.py	96.98% <ø> (-0.06%)	⬇️
tests/test_async_with.py	100.00% <ø> (ø)
tests/test_issues.py	86.30% <100.00%> (+0.63%)	⬆️
tests/test_pool.py	97.38% <100.00%> (ø)
tests/test_sha_connection.py	100.00% <100.00%> (ø)
tests/test_ssl.py	100.00% <100.00%> (ø)
aiomysql/utils.py	77.96% <0.00%> (-5.94%)	⬇️

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[Nothing4You]

based on the coverage report it should also be safe to remove _PoolConnectionContextManager.__aenter__ and _PoolConnectionContextManager.__aexit__.

when we add type annotations we can probably merge the various context managers into a single one like in aio-libs/aiopg#813 anyways.