ci: add retry and timeout config to pnpm audit step

The npm registry occasionally times out during pnpm audit, causing
the Security audit required check to fail with ERR_SOCKET_TIMEOUT.

Add fetch timeout (120s) and retry config (3 retries with 20–120s
backoff) via npm_config env vars to make the step resilient to
transient network issues.

Author: elkaix

.github/workflows/security.yml

@@ -25,6 +25,11 @@ jobs:
         with:
           node-version-file: .nvmrc
       - run: pnpm audit --json
+        env:
+          npm_config_fetch_timeout: 120000
+          npm_config_fetch_retries: 3
+          npm_config_fetch_retry_mintimeout: 20000
+          npm_config_fetch_retry_maxtimeout: 120000
 
   dependency-review:
     name: Dependency review