Update ruby/setup-ruby action to v1.281.0 (#739)

This PR contains the following updates:

| Package | Type | Update | Change | Pending |
|---|---|---|---|---|
| [ruby/setup-ruby](https://redirect.github.com/ruby/setup-ruby) |
action | minor | `v1.280.0` → `v1.281.0` | `v1.283.0` (+1) |

---

### Release Notes

<details>
<summary>ruby/setup-ruby (ruby/setup-ruby)</summary>

###
[`v1.281.0`](https://redirect.github.com/ruby/setup-ruby/releases/tag/v1.281.0)

[Compare
Source](https://redirect.github.com/ruby/setup-ruby/compare/v1.280.0...v1.281.0)

#### What's Changed

- Generate test matrix dynamically by
[@&#8203;ntkme](https://redirect.github.com/ntkme) in
[#&#8203;854](https://redirect.github.com/ruby/setup-ruby/pull/854)
- Add truffleruby-33.0.0,truffleruby+graalvm-33.0.0 by
[@&#8203;ruby-builder-bot](https://redirect.github.com/ruby-builder-bot)
in [#&#8203;857](https://redirect.github.com/ruby/setup-ruby/pull/857)

**Full Changelog**:
<ruby/setup-ruby@v1.280.0...v1.281.0>

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/line/line-bot-sdk-ruby).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi43NC41IiwidXBkYXRlZEluVmVyIjoiNDIuNzQuNSIsInRhcmdldEJyYW5jaCI6Im1hc3RlciIsImxhYmVscyI6WyJkZXBlbmRlbmN5IHVwZ3JhZGUiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/deploy-doc.yml

@@ -17,7 +17,7 @@ jobs:
       issues: write
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-      - uses: ruby/setup-ruby@d5f787ce339eb0767271bc01d922e85644c2c8ab # v1.280.0
+      - uses: ruby/setup-ruby@675dd7ba1b06c8786a1480d89c384f5620a42647 # v1.281.0
         with:
           ruby-version: '4.0.0'
       - run: bundle install

.github/workflows/publish.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-      - uses: ruby/setup-ruby@d5f787ce339eb0767271bc01d922e85644c2c8ab # v1.280.0
+      - uses: ruby/setup-ruby@675dd7ba1b06c8786a1480d89c384f5620a42647 # v1.281.0
         with:
           bundler-cache: true
           ruby-version: 4.0.0

.github/workflows/pull_request.yml

@@ -23,7 +23,7 @@ jobs:
     - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       with:
         submodules: true
-    - uses: ruby/setup-ruby@d5f787ce339eb0767271bc01d922e85644c2c8ab # v1.280.0
+    - uses: ruby/setup-ruby@675dd7ba1b06c8786a1480d89c384f5620a42647 # v1.281.0
       with:
         ruby-version: ${{ matrix.ruby }}
     - uses: actions/setup-java@f2beeb24e141e01a676f977032f5a29d81c9e27e # v5.1.0