Fix broken python requirements file

[peternied]

Description

When running python3 -m pip install -r requirements.txt on this file an errors occurs because >== isn't a validate qualifier for version information. This is causing issue with GitHub dependency scans and might have been the source of issues with mend and other tools configuration.

• See https://github.com/opensearch-project/opensearch-migrations/security/dependabot/11

Testing

Validated locally - with python3 -m pip install -r requirements.txt. I'll follow up separaretely on #688 to make sure we are using the error checking form of this build script

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.92%. Comparing base (b9d2d5f) to head (c024deb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #738      +/-   ##
============================================
+ Coverage     63.89%   63.92%   +0.03%     
  Complexity     1584     1584              
============================================
  Files           223      223              
  Lines          9092     9092              
  Branches        771      771              
============================================
+ Hits           5809     5812       +3     
+ Misses         2874     2871       -3     
  Partials        409      409              

Flag	Coverage Δ
unittests	63.92% <ø> (+0.03%)	⬆️

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[peternied]

Created issue Flaky test test_0006_OSB [1] and retrying the E2E Testing suite

• [1] https://opensearch.atlassian.net/browse/MIGRATIONS-1797

[peternied]

Second failure on test_0006_OSB [1], updated the issue and retrying the E2E Testing suite

• [1] https://opensearch.atlassian.net/browse/MIGRATIONS-1797

[mikaylathompson]

One note on debugging the test failures, it's actually two tests failing, both 0002 and 0006. It seems very unlikely to be related to this code change, but is a slightly more interesting debugging picture.

 =========================== short test summary info ============================
FAILED tests.py::E2ETests::test_0002_document - Exception: All 15 retry attempts failed. Please check the logs for more information.
FAILED tests.py::E2ETests::test_0006_OSB - AssertionError: Items in the first set but not the second:
'reindexed-logs' : Valid indices for source and target are not equal - Source = {'logs-231998', 'logs-191998', 'reindexed-logs', 'logs-241998', 'nyc_taxis', 'geonames', 'logs-201998', 'logs-221998', 'sonested', 'logs-181998', 'logs-211998'}, Target = {'logs-231998', 'logs-191998', 'logs-241998', 'nyc_taxis', 'geonames', 'logs-201998', 'logs-221998', 'sonested', 'logs-181998', 'logs-211998'}
======== 2 failed, 5 passed, 1 skipped, 7 warnings in 311.66s (0:05:11) ========