fix: revert lerna version to 8.1.2

[dhmlau]

When trying to publish (running the command npx lerna publish from-package), it seems to be stuck even after a few trial. Saw someone mentioning downgrading from 8.1.3 to 8.1.2 works. So giving this a try.

Checklist

• [x] DCO (Developer Certificate of Origin) signed in all commits
• [ ] npm test passes on your machine
• [ ] New tests added or existing tests modified to cover all changes
• [x] Code conforms with the style guide
• [ ] API Documentation in code was updated
• [ ] Documentation in /docs/site was updated
• [ ] Affected artifact templates in packages/cli were updated
• [ ] Affected example projects in examples/* were updated

👉 Check out how to submit a PR 👈

[coveralls]

Pull Request Test Coverage Report for Build 9454563564

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 55.287%

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Files with Coverage Reduction	New Missed Lines	%
packages/http-caching-proxy/src/http-caching-proxy.ts	5	66.67%
<!--	Total:	5		-->

Totals
Change from base Build 9449561530:	-0.05%
Covered Lines:	9566
Relevant Lines:	12465

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💛 - Coveralls