Test: Upgrade integration test cases lambda resources runtimes to nodejs14.x

[moelasmar]

Upgrade the integration test cases to use nodejs14.x in lambda functions instead of nodejs12.x

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #2474 (8100c52) into develop (e7a1496) will increase coverage by 0.90%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2474      +/-   ##
===========================================
+ Coverage    93.58%   94.49%   +0.90%     
===========================================
  Files           90       98       +8     
  Lines         6124     7297    +1173     
  Branches      1260     1522     +262     
===========================================
+ Hits          5731     6895    +1164     
- Misses         183      194      +11     
+ Partials       210      208       -2     

Impacted Files	Coverage Δ
samtranslator/region_configuration.py	77.77% <0.00%> (-22.23%)	⬇️
samtranslator/model/codedeploy.py	90.90% <0.00%> (-9.10%)	⬇️
samtranslator/validator/validator.py	91.80% <0.00%> (-3.85%)	⬇️
samtranslator/model/exceptions.py	97.67% <0.00%> (-2.33%)	⬇️
samtranslator/open_api/open_api.py	90.16% <0.00%> (-1.81%)	⬇️
samtranslator/model/s3_utils/uri_parser.py	68.42% <0.00%> (-0.81%)	⬇️
samtranslator/yaml_helper.py	89.47% <0.00%> (-0.53%)	⬇️
samtranslator/translator/logical_id_generator.py	90.62% <0.00%> (-0.29%)	⬇️
samtranslator/model/apigateway.py	96.98% <0.00%> (-0.18%)	⬇️
samtranslator/intrinsics/resource_refs.py	95.83% <0.00%> (-0.17%)	⬇️
... and 46 more

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