chore: Bump ruby version to support GEM_HOST_API_KEY (#50)

Author: keelerm84

.github/workflows/manual-publish.yml

@@ -27,7 +27,7 @@ jobs:
         name: Build and Test
         uses: ./.github/actions/ci
         with:
-          ruby-version: 2.6
+          ruby-version: '3.0'
 
       - id: publish
         name: Publish Package

.github/workflows/release-please.yml

@@ -31,7 +31,7 @@ jobs:
       - uses: ./.github/actions/ci
         if: ${{ steps.release.outputs.releases_created == 'true' }}
         with:
-          ruby-version: 2.6
+          ruby-version: '3.0'
 
       - uses: ./.github/actions/publish
         if: ${{ steps.release.outputs.releases_created == 'true' }}