fix: update provisioned concurrency to address cold starts

[ssvegaraju]

Issue #, if available:

Description of changes:
Updating the provisioned concurrency setting to prevent cold starts causing the gateway to timeout.

Checklist:

• Have you successfully deployed to an AWS account with your changes?
• Have you written new tests for your core changes, as applicable?

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 #661 (17d3987) into develop (1f7ae17) will not change coverage.
The diff coverage is n/a.

❗ Current head 17d3987 differs from pull request most recent head 8be10ac. Consider uploading reports for the commit 8be10ac to get more accurate results

@@           Coverage Diff            @@
##           develop     #661   +/-   ##
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  Coverage    95.65%   95.65%           
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  Files            4        4           
  Lines          207      207           
  Branches        30       30           
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  Hits           198      198           
  Misses           9        9           

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[Bingjiling]

LGTM!