The highest tagged major version is v2.

internal/

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Path	Synopsis
cltest Importing cltest should only be for top level black box (X_test package) integration tests, for example testing against the Application object itself.	Importing cltest should only be for top level black box (X_test package) integration tests, for example testing against the Application object itself.
heavyweight
gethwrappers2 Package gethwrappers keeps track of the golang wrappers of the solidity contracts	Package gethwrappers keeps track of the golang wrappers of the solidity contracts
generated/offchainaggregator
mocks
testutils
configtest
configtest/v2
evmtest
evmtest/v2
httptest
keystest
pgtest
solanatest