Update rubygems/release-gem action to v1.2.0 (#792)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[rubygems/release-gem](https://redirect.github.com/rubygems/release-gem)
| action | minor | `v1.1.4` → `v1.2.0` |

---

### Release Notes

<details>
<summary>rubygems/release-gem (rubygems/release-gem)</summary>

###
[`v1.2.0`](https://redirect.github.com/rubygems/release-gem/releases/tag/v1.2.0)

[Compare
Source](https://redirect.github.com/rubygems/release-gem/compare/v1.1.4...v1.2.0)

#### What's Changed

- Pin `rubygems/configure-rubygems-credentials` to a commit SHA by
[@&#8203;haines](https://redirect.github.com/haines) in
[#&#8203;31](https://redirect.github.com/rubygems/release-gem/pull/31)
- Add configurable token input for git authentication by
[@&#8203;TonyCTHsu](https://redirect.github.com/TonyCTHsu) in
[#&#8203;30](https://redirect.github.com/rubygems/release-gem/pull/30)
- Allow specifying the working directory to run the release task in by
[@&#8203;segiddins](https://redirect.github.com/segiddins) in
[#&#8203;12](https://redirect.github.com/rubygems/release-gem/pull/12)

#### New Contributors

- [@&#8203;haines](https://redirect.github.com/haines) made their first
contribution in
[#&#8203;31](https://redirect.github.com/rubygems/release-gem/pull/31)
- [@&#8203;TonyCTHsu](https://redirect.github.com/TonyCTHsu) made their
first contribution in
[#&#8203;30](https://redirect.github.com/rubygems/release-gem/pull/30)

**Full Changelog**:
<rubygems/release-gem@v1.1.4...v1.2.0>

</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:eyJjcmVhdGVkSW5WZXIiOiI0My4xMDIuMTEiLCJ1cGRhdGVkSW5WZXIiOiI0My4xMDIuMTEiLCJ0YXJnZXRCcmFuY2giOiJtYXN0ZXIiLCJsYWJlbHMiOlsiZGVwZW5kZW5jeSB1cGdyYWRlIl19-->

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

Author: renovate[bot]

.github/workflows/publish.yml

@@ -45,7 +45,7 @@ jobs:
 
           git add lib/line/bot/version.rb Gemfile.lock
           git commit -m "Set version to $VERSION"
-      - uses: rubygems/release-gem@e9a6361a0b14562539327c2a02373edc56dd3169 # v1.1.4
+      - uses: rubygems/release-gem@6317d8d1f7e28c24d28f6eff169ea854948bd9f7 # v1.2.0
 
       - name: Create GitHub Issue on Failure
         if: failure()