Support custom ttl_dns_cache connector configuration

[jakob-keller]

Description of Change

Support custom ttl_dns_cache connector configuration.

Assumptions

None

Checklist for All Submissions

• I have added change info to CHANGES.rst
• If this is resolving an issue (needed so future developers can determine if change is still necessary and under what conditions) (can be provided via link to issue with these details):
  • Detailed description of issue
  • Alternative methods considered (if any)
  • How issue is being resolved
  • How issue can be reproduced
• If this is providing a new feature (can be provided via link to issue with these details): closes Allow passing ttl_dns_cache in connector_args #1258
  • Detailed description of new feature
  • Why needed
  • Alternatives methods considered (if any)

Checklist when updating botocore and/or aiohttp versions

• I have read and followed CONTRIBUTING.rst
• I have updated test_patches.py where/if appropriate (also check if no changes necessary)
• I have ensured that the awscli/boto3 versions match the updated botocore version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.53%. Comparing base (bdfbfd5) to head (c795b0c).
Report is 43 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1270      +/-   ##
==========================================
- Coverage   87.79%   87.53%   -0.26%     
==========================================
  Files          67       67              
  Lines        5905     5913       +8     
==========================================
- Hits         5184     5176       -8     
- Misses        721      737      +16     

Flag	Coverage Δ
unittests	87.53% <100.00%> (-0.26%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[thehesiod]

wait, this isn't doing anything with the param ;)

[thehesiod]

ah, nevermind, see it now