fix(deps): update dependency @openfeature/env-var-provider to v0.3.1 (#…

…307)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| @​openfeature/env-var-provider | [`0.3.0` ->
`0.3.1`](https://renovatebot.com/diffs/npm/@openfeature%2fenv-var-provider/0.3.0/0.3.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@openfeature%2fenv-var-provider/0.3.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@openfeature%2fenv-var-provider/0.3.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@openfeature%2fenv-var-provider/0.3.0/0.3.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@openfeature%2fenv-var-provider/0.3.0/0.3.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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