chore(credential-provider-imds): arrow fn in ImdsCredentials

[trivikr]

Issue #, if available:
Done as part of IMDS v2 in JS-1802

Description of changes:
adds arrow functions in ImdsCredentials.ts

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[codecov-commenter]

Codecov Report

Merging #1317 into master will increase coverage by 4.44%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1317      +/-   ##
==========================================
+ Coverage   73.04%   77.49%   +4.44%     
==========================================
  Files         287      286       -1     
  Lines       12730    11897     -833     
  Branches     2922     2600     -322     
==========================================
- Hits         9299     9219      -80     
+ Misses       3431     2678     -753     

Impacted Files	Coverage Δ
packages/region-provider/src/fromEnv.ts	100.00% <0.00%> (ø)
protocol_tests/aws-ec2/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-json/runtimeConfig.ts	100.00% <0.00%> (ø)
packages/property-provider/src/memoize.ts	100.00% <0.00%> (ø)
protocol_tests/aws-query/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-ec2/EC2ProtocolClient.ts	92.30% <0.00%> (ø)
protocol_tests/aws-restxml/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-restjson/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-json/JsonProtocolClient.ts	92.30% <0.00%> (ø)
packages/middleware-retry/src/configurations.ts	100.00% <0.00%> (ø)
... and 14 more

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