fix(eventstream-serde-browser): set module to dist output

[hmaurer]

Description of changes:
The module property of eventstream-serde-browser/package.json was not set to ./dist/es/index.js, which is what Typescript (tsconfig.es.json) is configured to output the ES bundle to. This pull request updates it.

Question: should I version bump the package as well?

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #1434 into master will increase coverage by 0.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1434      +/-   ##
==========================================
+ Coverage   79.08%   79.59%   +0.50%     
==========================================
  Files         287      298      +11     
  Lines       11155    11345     +190     
  Branches     2360     2418      +58     
==========================================
+ Hits         8822     9030     +208     
+ Misses       2333     2315      -18     

Impacted Files	Coverage Δ
packages/util-create-request/src/index.ts	100.00% <0.00%> (ø)
protocol_tests/aws-ec2/protocols/Aws_ec2.ts	66.94% <0.00%> (ø)
packages/middleware-signing/src/middleware.ts	91.66% <0.00%> (ø)
protocol_tests/aws-query/protocols/Aws_query.ts	66.72% <0.00%> (ø)
...rotocol_tests/aws-restxml/protocols/Aws_restXml.ts	66.25% <0.00%> (ø)
...ocol_tests/aws-restjson/protocols/Aws_restJson1.ts	61.19% <0.00%> (ø)
...iddleware-sdk-s3-control/src/prepend-account-id.ts	86.95% <0.00%> (ø)
...re-bucket-endpoint/src/bucketEndpointMiddleware.ts	91.30% <0.00%> (ø)
...dk-transcribe-streaming/src/middleware-endpoint.ts	95.23% <0.00%> (ø)
...rovider-imds/src/remoteProvider/ImdsCredentials.ts
... and 23 more

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[AllanZhengYP]

@hmaurer Thanks for the PR 🎉. You don't need to bump the package version

[github-actions]

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