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chore: release v0.6.0 (equinix-labs#74)

This PR updates package version to v0.6.0.

When I run `make generate`, a lot of test files were generated. Those
files were not generated by the sync GHA, not sure if it's intentional.

In the sync GHA, there's `make generate -o patch-spec -o clean`, which
doesn't generate the test scripts. On the other hand `make generate`
WILL generate the test scripts.