Update dependency dotenv-rails to v3 (#141)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [dotenv-rails](https://togithub.com/bkeepers/dotenv) | `2.8.1` ->
`3.0.0` |
[![age](https://developer.mend.io/api/mc/badges/age/rubygems/dotenv-rails/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
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|
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|

---

### Release Notes

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

###
[`v3.0.0`](https://togithub.com/bkeepers/dotenv/blob/HEAD/Changelog.md#300)

[Compare
Source](https://togithub.com/bkeepers/dotenv/compare/v2.8.1...v3.0.0)

**Breaking Changes**

- Ruby >= 3.0 and Rails >= 6.1 are now required. Lock dotenv to `~> 2.0`
if you are using an outdated Ruby or Rails version.
[bkeepers/dotenv#466,
[bkeepers/dotenv#471
- `\n` is no longer expanded into a newline in quoted strings. Use
multi-line strings with real line breaks, or set
`DOTENV_LINEBREAK_MODE=legacy` to preserve the old behavior.
[@&#8203;nitsujri](https://togithub.com/nitsujri)
[bkeepers/dotenv#423
- `ENV` will be [automatically restored between
tests](https://togithub.com/bkeepers/dotenv#autorestore-in-tests)
(`ActiveSupport::TestCase` and `Rspec`).
[bkeepers/dotenv#472,
[bkeepers/dotenv#475
- Fixed precedence when using `Dotenv::Rails.overload`. So now
`.env.development.local` will overwrite `.env.local`, which will
overwrite `.env.development`, which will overwrite `.env`.
[@&#8203;eriklovmo](https://togithub.com/eriklovmo) -
[bkeepers/dotenv#460
- The instrumentation event `dotenv.load` has been renamed to
`load.dotenv` to properly make use of namespaces in
[ActiveSupport::Notifications](https://guides.rubyonrails.org/active_support_instrumentation.html)
[bkeepers/dotenv#472

**Other improvements**

- All changes to ENV will be logged in Rails apps.
[bkeepers/dotenv#473
- Fixed an issue where `rake` loaded development files
(`.env*development`) for test-related tasks.
[bkeepers/dotenv#470
- Add `-i`/`--ignore` option to `dotenv` CLI to optionally ignore
missing files. [@&#8203;stevenharman](https://togithub.com/stevenharman)
[bkeepers/dotenv#463
- You can [customize which files get
loaded](https://togithub.com/bkeepers/dotenv#customizing-rails) by
setting `Dotenv::Rails.files`.
[bkeepers/dotenv#468

**Deprecations**

- The `dotenv-rails` gem is now superfluous. It's not technically
deprecated yet and will continue to work, but the `dotenv` gem does the
same thing.
[bkeepers/dotenv#468
- `Dotenv::Railtie` has been deprecated. Use `Dotenv::Rails`.
[bkeepers/dotenv#468
- `Dotenv.overload` has been replaced with `overwrite`. `overload` will
still work and is not technically deprecated, but documentation refers
to `Dotenv.overwrite` now.
[bkeepers/dotenv#469

**New Contributors**

- [@&#8203;stevenharman](https://togithub.com/stevenharman) made their
first contribution in
[bkeepers/dotenv#463
- [@&#8203;eriklovmo](https://togithub.com/eriklovmo) made their first
contribution in
[bkeepers/dotenv#460
- [@&#8203;nitsujri](https://togithub.com/nitsujri) made their first
contribution in
[bkeepers/dotenv#423

**Full Changelog**:
bkeepers/dotenv@v2.8.1...v3.0.0

</details>

---

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Gemfile.lock

@@ -93,10 +93,10 @@ GEM
     date (3.3.3)
     diff-lcs (1.5.1)
     docile (1.4.0)
-    dotenv (2.8.1)
-    dotenv-rails (2.8.1)
-      dotenv (= 2.8.1)
-      railties (>= 3.2)
+    dotenv (3.0.0)
+    dotenv-rails (3.0.0)
+      dotenv (= 3.0.0)
+      railties (>= 6.1)
     erubi (1.12.0)
     execjs (2.8.1)
     factory_bot (6.4.5)
@@ -128,7 +128,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.5)
     mini_portile2 (2.8.5)
-    minitest (5.21.2)
+    minitest (5.22.2)
     msgpack (1.7.2)
     mysql2 (0.5.5)
     net-imap (0.3.7)
@@ -141,7 +141,7 @@ GEM
     net-smtp (0.3.3)
       net-protocol
     nio4r (2.5.9)
-    nokogiri (1.15.5)
+    nokogiri (1.16.2)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     pry (0.14.2)