Update dependency dotenv-rails to v3.1.2 (#158)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [dotenv-rails](https://github.com/bkeepers/dotenv) | `3.1.0` ->
`3.1.2` |
[![age](https://developer.mend.io/api/mc/badges/age/rubygems/dotenv-rails/3.1.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/rubygems/dotenv-rails/3.1.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/rubygems/dotenv-rails/3.1.0/3.1.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/rubygems/dotenv-rails/3.1.0/3.1.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>bkeepers/dotenv (dotenv-rails)</summary>

###
[`v3.1.2`](https://github.com/bkeepers/dotenv/blob/HEAD/Changelog.md#312)

[Compare
Source](https://github.com/bkeepers/dotenv/compare/v3.1.1...v3.1.2)

- Fix: "can't modify frozen Hash" when stubbing ENV by
[@&#8203;bkeepers](https://github.com/bkeepers) in
[https://github.com/bkeepers/dotenv/pull/504](https://github.com/bkeepers/dotenv/pull/504)

**Full Changelog**:
bkeepers/dotenv@v3.1.1...v3.1.2

###
[`v3.1.1`](https://github.com/bkeepers/dotenv/releases/tag/v3.1.1):
3.1.1

[Compare
Source](https://github.com/bkeepers/dotenv/compare/v3.1.0...v3.1.1)

#### What's Changed

- Require version file so VERSION is available by
[@&#8203;javierjulio](https://github.com/javierjulio) in
[https://github.com/bkeepers/dotenv/pull/495](https://github.com/bkeepers/dotenv/pull/495)
- Fix template (-t) handling of multi-line variables by
[@&#8203;maxjacobson](https://github.com/maxjacobson) in
[https://github.com/bkeepers/dotenv/pull/502](https://github.com/bkeepers/dotenv/pull/502)
- Guard against restore being called with no previously saved state by
[@&#8203;bkeepers](https://github.com/bkeepers) in
[https://github.com/bkeepers/dotenv/pull/503](https://github.com/bkeepers/dotenv/pull/503)

#### New Contributors

- [@&#8203;javierjulio](https://github.com/javierjulio) made their
first contribution in
[https://github.com/bkeepers/dotenv/pull/495](https://github.com/bkeepers/dotenv/pull/495)
- [@&#8203;maxjacobson](https://github.com/maxjacobson) made their
first contribution in
[https://github.com/bkeepers/dotenv/pull/502](https://github.com/bkeepers/dotenv/pull/502)

**Full Changelog**:
bkeepers/dotenv@v3.1.0...v3.1.1

</details>

---

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Gemfile.lock

@@ -95,9 +95,9 @@ GEM
     date (3.3.4)
     diff-lcs (1.5.1)
     docile (1.4.0)
-    dotenv (3.1.0)
-    dotenv-rails (3.1.0)
-      dotenv (= 3.1.0)
+    dotenv (3.1.2)
+    dotenv-rails (3.1.2)
+      dotenv (= 3.1.2)
       railties (>= 6.1)
     erubi (1.12.0)
     execjs (2.8.1)