Release refs/tags/v1.6.0-pre.2

Another parser bug fixed since the last prerelease, going to give it a little more time before letting 1.6.0 out

What's Changed

Add whitespace tests. by @cjyar in https://github.com/joho/godotenv/pull/210
Bump actions/setup-go from 3 to 4 by @dependabot in https://github.com/joho/godotenv/pull/207
Update cmd.go by @Adamsbite in https://github.com/joho/godotenv/pull/221
Fix panic because of wrong function by @lotusirous in https://github.com/joho/godotenv/pull/223
chore: fix typo by @ALX99 in https://github.com/joho/godotenv/pull/231
Re-add global env variable substitution by @Envek in https://github.com/joho/godotenv/pull/227
fix: if a line contains multiple # characters, there will be issues w… by @astak16 in https://github.com/joho/godotenv/pull/238

@cjyar made their first contribution in https://github.com/joho/godotenv/pull/210
@Adamsbite made their first contribution in https://github.com/joho/godotenv/pull/221
@lotusirous made their first contribution in https://github.com/joho/godotenv/pull/223
@ALX99 made their first contribution in https://github.com/joho/godotenv/pull/231
@Envek made their first contribution in https://github.com/joho/godotenv/pull/227
@astak16 made their first contribution in https://github.com/joho/godotenv/pull/238

Full Changelog: https://github.com/joho/godotenv/compare/v1.5.1...v1.6.0-pre.2