Update Node Version to 18.x for Bluehawk (#3283)

## Pull Request Info

Current Node version on 15.x. Need to update Node Version to 18.x for
Bluehawk compatibility.

Author: lindseymoore

.github/workflows/bluehawk.yml

@@ -10,5 +10,5 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v1
         with:
-          node-version: 15.x
+          node-version: 18.x
       - run: npx bluehawk check -i "*.md" -i "*.properties" -i "*.lock" examples tutorial