chore: update GH actions desc

Signed-off-by: dhmlau <dhmlau@ca.ibm.com>

Author: dhmlau

.github/workflows/pr-build.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Use Node.js 18
+      - name: Use Node.js 22
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: 22.18.0

.github/workflows/site-build.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Use Node.js 18
+      - name: Use Node.js 22
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: 22.18.0