fix: add missing maxWorkkers parameter to config.base.yml

[jhockett]

Description of changes

Happened to bump into a missing flag value for --maxWorkers when looking through the config files

Issue #, if available

Description of how you validated changes

Checklist

• PR description included

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 #11833 (98452e6) into dev (984c0f8) will increase coverage by 0.70%.
The diff coverage is 56.55%.

@@            Coverage Diff             @@
##              dev   #11833      +/-   ##
==========================================
+ Coverage   49.45%   50.16%   +0.70%     
==========================================
  Files         692      707      +15     
  Lines       33424    34306     +882     
  Branches     6840     7067     +227     
==========================================
+ Hits        16529    17208     +679     
- Misses      15370    15597     +227     
+ Partials     1525     1501      -24     

Impacted Files	Coverage Δ
...y-appsync-simulator/src/resolvers/unit-resolver.ts	90.32% <0.00%> (ø)
...ages/amplify-appsync-simulator/src/schema/index.ts	70.68% <0.00%> (-1.25%)	⬇️
...tor/src/velocity/util/transform/dynamodb-filter.ts	4.93% <0.00%> (ø)
...ync-simulator/src/velocity/util/transform/index.ts	21.05% <0.00%> (ø)
...c/provider-utils/awscloudformation/import/index.ts	31.02% <ø> (ø)
...vice-walkthrough-types/cognito-user-input-types.ts	100.00% <ø> (ø)
...wscloudformation/utils/auth-sms-workflow-helper.ts	43.75% <0.00%> (ø)
...ges/amplify-category-custom/src/commands/custom.ts	0.00% <0.00%> (ø)
...ion/service-walkthroughs/lambdaLayerWalkthrough.ts	11.21% <0.00%> (ø)
...mation/service-walkthroughs/scheduleWalkthrough.ts	16.49% <0.00%> (ø)
... and 225 more

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