Update botocore tests.

[umaannamalai]

This PR updates the moto decorators used in botocore tests and removes py27 dependencies listed in tox.ini. It also drops testing for Python 3.7 since botocore no longer supports this version.

[github-actions[bot]]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	7	0	0	0.75s
❌ PYTHON	flake8	7		7	0.46s
✅ PYTHON	isort	7	0	0	0.18s
❌ PYTHON	pylint	7		8	2.61s

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2eda775) 80.82% compared to head (31fb18e) 81.20%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1051 +/- ## ========================================== + Coverage 80.82% 81.20% +0.37% ========================================== Files 190 190 Lines 19745 19745 Branches 3468 3468 ========================================== + Hits 15959 16033 +74 + Misses 2787 2723 -64 + Partials 999 989 -10 ```

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[lrafeei]

Could we take this out as well since v1.3.1 was released in 2018 and 3.7 support was dropped?

# patch earlier versions of moto to support py37
if sys.version_info >= (3, 7) and MOTO_VERSION <= (1, 3, 1):
    import re
    moto.packages.responses.responses.re._pattern_type = re.Pattern

[umaannamalai]

Could we take this out as well since v1.3.1 was released in 2018 and 3.7 support was dropped?

# patch earlier versions of moto to support py37
if sys.version_info >= (3, 7) and MOTO_VERSION <= (1, 3, 1):
    import re
    moto.packages.responses.responses.re._pattern_type = re.Pattern

Sure thing! I'll add that in a followup PR.