Update module-path to v2

[jazanne]

module path should be updated for v2+

module-path The module's module path, usually the repository location from which the module can be downloaded by Go tools. For module versions v2 and later, this value must end with the major version number, such as /v2.

• docs

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test with

go get github.com/launchdarkly/ld-find-code-refs/v2@c5029a63b4da2a6ff9efbf63b400b16eff343d6c