Update ruby/setup-ruby action to v1.259.0 (#1905)

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

Author: renovate[bot]

.github/workflows/pr-build.yml

@@ -24,7 +24,7 @@ jobs:
           node-version: 22.19.0
 
       - name: Set up Ruby 3.2
-        uses: ruby/setup-ruby@3fee6763234110473bd57dd4595c5199fce2c510 # v1.258.0
+        uses: ruby/setup-ruby@866b91cc020931c510d42e43e498a7f07d335f60 # v1.259.0
         with:
           ruby-version: 3.2
 

.github/workflows/site-build.yml

@@ -24,7 +24,7 @@ jobs:
           node-version: 22.19.0
 
       - name: Set up Ruby 3.2
-        uses: ruby/setup-ruby@3fee6763234110473bd57dd4595c5199fce2c510 # v1.258.0
+        uses: ruby/setup-ruby@866b91cc020931c510d42e43e498a7f07d335f60 # v1.259.0
         with:
           ruby-version: 3.2