refactor: Remove bluebird from lib/plugins/aws

[juanjoDiaz]

Addresses: #7171

[codecov]

Codecov Report

Merging #9054 (b2b566e) into master (d2e6a8a) will increase coverage by 0.09%.
The diff coverage is 90.50%.

@@            Coverage Diff             @@
##           master    #9054      +/-   ##
==========================================
+ Coverage   87.05%   87.15%   +0.09%     
==========================================
  Files         287      288       +1     
  Lines       10986    11020      +34     
==========================================
+ Hits         9564     9604      +40     
+ Misses       1422     1416       -6     

Impacted Files	Coverage Δ
lib/configuration/variables/parse.js	100.00% <ø> (ø)
lib/plugins/aws/package/compile/functions.js	95.89% <ø> (-0.35%)	⬇️
lib/plugins/aws/rollbackFunction.js	88.23% <71.42%> (-11.77%)	⬇️
lib/Serverless.js	92.41% <75.00%> (-1.12%)	⬇️
scripts/serverless.js	84.81% <85.71%> (+10.69%)	⬆️
lib/plugins/aws/utils/credentials.js	94.44% <86.95%> (+2.50%)	⬆️
lib/plugins/aws/provider.js	95.14% <88.09%> (+0.28%)	⬆️
...n/variables/eventually-report-resolution-errors.js	100.00% <100.00%> (ø)
lib/configuration/variables/resolve.js	100.00% <100.00%> (ø)
lib/plugins/aws/metrics.js	100.00% <100.00%> (ø)
... and 3 more

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[pgrzesik]

Thanks @juanjoDiaz - good job here 👍