Exclude pymssql tests for python 3.6

[basepi]

Ref pymssql/pymssql#787

[ghost]

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• Start Time: 2022-11-15T18:46:34.599+0000

• Duration: 19 min 37 sec

Test stats 🧪

Test	Results
Failed	0
Passed	5075
Skipped	3470
Total	8545

💚 Flaky test report

Tests succeeded.

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /test linters : Run the Python linters only.

• /test full : Run the full matrix of tests.

• /test benchmark : Run the APM Agent Python benchmarks tests.

• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (68/68)	💚
Files	100.0% (230/230)	💚
Classes	100.0% (230/230)	💚
Lines	92.192% (18456/20019)	👍
Conditionals	75.244% (2854/3793)	👍