feat: use lock-threads GH action for inactive issues/PRs

[trivikr]

Issue #, if available:
Fixes: #1880

Description of changes:
use lock-threads GH action for inactive issues/PRs

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[codecov-io]

Codecov Report

Merging #1881 (6c5abfb) into master (f2a47e8) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1881   +/-   ##
=======================================
  Coverage   79.30%   79.31%           
=======================================
  Files         368      368           
  Lines       15132    15153   +21     
  Branches     3222     3234   +12     
=======================================
+ Hits        12001    12019   +18     
- Misses       3131     3134    +3     

Impacted Files	Coverage Δ
packages/util-waiter/src/utils/validate.ts	81.81% <0.00%> (-18.19%)	⬇️
lib/storage/src/data-chunk/readable-helper.ts	88.23% <0.00%> (-4.08%)	⬇️
packages/util-dynamodb/src/convertToAttr.ts	98.70% <0.00%> (-1.30%)	⬇️
packages/util-waiter/src/waiter.ts	100.00% <0.00%> (ø)
protocol_tests/aws-ec2/endpoints.ts	81.48% <0.00%> (ø)
protocol_tests/aws-json/endpoints.ts	81.48% <0.00%> (ø)
protocol_tests/aws-query/endpoints.ts	81.48% <0.00%> (ø)
packages/util-dynamodb/src/marshall.ts	100.00% <0.00%> (ø)
protocol_tests/aws-restxml/endpoints.ts	81.48% <0.00%> (ø)
protocol_tests/aws-restjson/endpoints.ts	81.48% <0.00%> (ø)
... and 10 more

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 6c5abfb
• Result: SUCCEEDED
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[github-actions]

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