Pin ruby/setup-ruby to commit SHA (align with repo convention)

Matches the SHA pin used in test.yml and jekyll_build.yml
(ruby/setup-ruby@afeafc3 # v1.310.0)
for supply-chain consistency. Addresses PR review feedback.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: RomanIakovlev

.github/workflows/lint.yml

@@ -19,7 +19,7 @@ jobs:
           repository: ${{ github.event.pull_request.head.repo.full_name || github.repository }}
 
       - name: Setup Ruby
-        uses: ruby/setup-ruby@v1.306.0
+        uses: ruby/setup-ruby@afeafc3d1ab54a631816aba4c914a0081c12ff2f # v1.310.0
         with:
           bundler-cache: false
 
@@ -41,7 +41,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.ref || github.ref }}
 
       - name: Setup Ruby
-        uses: ruby/setup-ruby@v1.306.0
+        uses: ruby/setup-ruby@afeafc3d1ab54a631816aba4c914a0081c12ff2f # v1.310.0
         with:
           bundler-cache: true