Add weekly dependabot configuration

[peternied]

Description

Every week will make a consolidated PR for our major dependency areas for npm, gradle, and github actions.

Issues Resolved

• Resolves MIGRATIONS-2448 | Enable dependabot for dependencies

Testing

Its running on my fork, now the only changes needed to get outstanding PRs merged is fixes due to incoming library changes.

Check List

• New functionality includes testing
• Public documentation issue/PR created, if applicable.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.91%. Comparing base (a5d393f) to head (001fa8d).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1366   +/-   ##
=========================================
  Coverage     79.91%   79.91%           
  Complexity     2977     2977           
=========================================
  Files           443      443           
  Lines         16217    16217           
  Branches       1087     1087           
=========================================
  Hits          12960    12960           
  Misses         2617     2617           
  Partials        640      640           

Flag	Coverage Δ
unittests	79.91% <ø> (ø)

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[lewijacn]

Anything we can do so that all CDK dependencies with the same CDK lib version, are consistent? We have had an issue in the past when these versions aren't uniform, https://github.com/peternied/opensearch-migrations/pull/35/files

    "@aws-cdk/aws-servicecatalogappregistry-alpha": "2.179.0-alpha.0",
    "@aws-cdk/aws-msk-alpha": "2.179.0-alpha.0",
    "aws-cdk": "2.179.0",
    "aws-cdk-lib": "2.179.0",

To

   "@aws-cdk/aws-servicecatalogappregistry-alpha": "2.179.0-alpha.0",
    "@aws-cdk/aws-msk-alpha": "2.179.0-alpha.0",
    "aws-cdk": "2.1005.0",
    "aws-cdk-lib": "2.184.1",

[peternied]

Anything we can do so that all CDK dependencies with the same CDK lib version, are consistent?

CI checks are running on the PR, is that good enough? Looking at the generated PR @aws-sdk/client-acm, @aws-sdk/client-kafka, @aws-sdk/client-lambda were all on different versions.