Upgrade cspell packages to version ^6.12.0

[jeremymeng]

to address dependabot issue https://github.com/Azure/azure-sdk-for-js/security/dependabot/13

[jeremymeng]

Do we know why we need to pin the versions using package-lock.json?

[azure-sdk]

The following pipelines have been queued for testing:
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java - template - tests
js - template
net - template
net - template - tests
python - template
python - template - tests
You can sign off on the approval gate to test the release stage of each pipeline.
See eng/common workflow

[weshaggard]

Do we know why we need to pin the versions using package-lock.json?

Because the last time we didn't we kept getting broken so we decided to lock the dependencies to make things a little more stable.

[weshaggard]

Change looks good assuming the tests pass.

[ghost]

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