chore(deps): update ruby/setup-ruby action to v1.251.0 (#2111)

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

Author: renovate[bot]

.github/workflows/repotests.yml

@@ -257,7 +257,7 @@ jobs:
         uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: '3.12'
-      - uses: ruby/setup-ruby@65937904bcddfb93f8130882d9afa8597c45f3b5 # v1.249.0
+      - uses: ruby/setup-ruby@e8621f0b86851d7377d85882bb751b24dfadd958 # v1.251.0
         with:
           ruby-version: '3.4'
       - name: setup-cocoapods # Not using an action, as it is not implemented for windows!
@@ -1012,7 +1012,7 @@ jobs:
         uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: '3.12'
-      - uses: ruby/setup-ruby@65937904bcddfb93f8130882d9afa8597c45f3b5 # v1.249.0
+      - uses: ruby/setup-ruby@e8621f0b86851d7377d85882bb751b24dfadd958 # v1.251.0
         with:
           ruby-version: '3.4'
       - name: pip install custom-json-diff