Bump rubygems/release-gem from 1.1.4 to 1.2.0

Bumps [rubygems/release-gem](https://github.com/rubygems/release-gem) from 1.1.4 to 1.2.0.
- [Release notes](https://github.com/rubygems/release-gem/releases)
- [Commits](rubygems/release-gem@e9a6361...6317d8d)

---
updated-dependencies:
- dependency-name: rubygems/release-gem
  dependency-version: 1.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/push_gem.yml

@@ -46,7 +46,7 @@ jobs:
         if: matrix.ruby == 'jruby'
 
       - name: Publish to RubyGems
-        uses: rubygems/release-gem@e9a6361a0b14562539327c2a02373edc56dd3169 # v1.1.4
+        uses: rubygems/release-gem@6317d8d1f7e28c24d28f6eff169ea854948bd9f7 # v1.2.0
 
       - name: Create GitHub release
         run: |