Update node to v18.20.8 (#1887)

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

@@ -21,7 +21,7 @@ jobs:
       - name: Use Node.js 18
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
-          node-version: 18
+          node-version: 18.20.8
 
       - name: Set up Ruby 3.2
         uses: ruby/setup-ruby@2a7b30092b0caf9c046252510f9273b4875f3db9 # v1.254.0

.github/workflows/site-build.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Use Node.js 18
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
-          node-version: 18
+          node-version: 18.20.8
 
       - name: Set up Ruby 3.2
         uses: ruby/setup-ruby@2a7b30092b0caf9c046252510f9273b4875f3db9 # v1.254.0