Update module github.com/caarlos0/env/v6 to v6.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/caarlos0/env/v6	require	minor	v6.5.0 -> v6.6.0

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Release Notes

caarlos0/env

v6.6.0

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Changelog

f2ced39 chore(deps): bump actions/cache from v2 to v2.1.4 (#​156)
41425b4 chore(deps): bump actions/cache from v2 to v2.1.4 (#​160)
346d77c chore(deps): bump actions/cache from v2.1.4 to v2.1.5 (#​164)
c33df78 chore(deps): bump actions/checkout from 2 to 2.3.4 (#​168)
7c39877 chore(deps): bump codecov/codecov-action from 1 to 1.5.0 (#​167)
d80f61d chore(deps): bump golangci/golangci-lint-action from v2 to v2.5.2 (#​161)
2174282 chore(deps): bump goreleaser/goreleaser-action from 2 to 2.5.0 (#​166)
6cbd70c docs/test: document how to use custom time formats (#​172)
fd499bb feat: allow to unset a variable after reading it (#​171)
3de7ad1 feat: go 1.16, test on mac and windows (#​159)
b2f4697 feat: notEmpty tag (#​174)
eb9cdc4 fix(ci): workflow versions
9a4342d fix(ci): workflow versions
d552093 fix: linter
0397ad7 fix: some cases on windows (#​170)
f878cc5 tests: use require instead of assert

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