fix(util-waiter): fix compiling error with waiter

[AllanZhengYP]

Fixes #1803

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[codecov-io]

Codecov Report

Merging #1812 (dbd01e1) into master (dd04fa3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1812   +/-   ##
=======================================
  Coverage   79.30%   79.31%           
=======================================
  Files         368      368           
  Lines       15132    15129    -3     
  Branches     3222     3222           
=======================================
- Hits        12001    12000    -1     
+ Misses       3131     3129    -2     

Impacted Files	Coverage Δ
packages/util-waiter/src/waiter.ts	100.00% <ø> (ø)
protocol_tests/aws-ec2/endpoints.ts	81.48% <ø> (ø)
protocol_tests/aws-json/endpoints.ts	81.48% <ø> (ø)
protocol_tests/aws-query/endpoints.ts	81.48% <ø> (ø)
protocol_tests/aws-restjson/endpoints.ts	81.48% <ø> (ø)
protocol_tests/aws-restxml/endpoints.ts	81.48% <ø> (ø)
packages/util-waiter/src/createWaiter.ts	100.00% <100.00%> (+11.76%)	⬆️
packages/util-waiter/src/poller.ts	100.00% <100.00%> (ø)
packages/util-waiter/src/utils/validate.ts	100.00% <100.00%> (ø)

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[alexforsyth]

Sweet, lgtm

[github-actions]

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