fix(middleware-sdk-route53): typo in file extension of test

[trivikr]

Issue

Noticed in build failures while using root TSConfig in clients at #3151

Description

Removes typo in the file extension of a test file

Testing

Unit tests are successful.

$ middleware-sdk-route53> yarn test
yarn run v1.22.17
$ jest
 PASS  src/id-normalizer.spec.ts
 PASS  src/index.spec.ts
 PASS  src/change-resource-record-sets.spec.ts

Test Suites: 3 passed, 3 total
Tests:       16 passed, 16 total
Snapshots:   0 total
Time:        4.218 s
Ran all test suites.
Done in 5.24s.

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