target specific sha for actions

Author: jsonbailey

.github/workflows/server-ai-langchain.yml

@@ -14,8 +14,8 @@ jobs:
   build-test-langchain-provider:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
         with:
           node-version: 22.x
           registry-url: 'https://registry.npmjs.org'