Fix ci-ets: pin @types/node@18 for the ArkAnalyzer build

ArkAnalyzer's npm install pulls the floating latest @types/node, whose
new d.ts files (e.g. ffi.d.ts) use syntax that ArkAnalyzer's bundled
TypeScript cannot parse, so `npm run build` fails with TS1139/TS1005
errors and the whole ci-ets job dies before any Gradle test runs.
Pin a compatible @types/node major right after npm install.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: CaelmBleidd

.github/workflows/ci.yml

@@ -135,6 +135,10 @@ jobs:
           cd $DEST_DIR
 
           npm install
+          # ArkAnalyzer's bundled TypeScript cannot parse the d.ts files of the
+          # latest floating @types/node (e.g. ffi.d.ts uses newer syntax and
+          # breaks `npm run build` with TS1139 etc.); pin a compatible major.
+          npm install --no-save @types/node@18
           npm run build
 
       - name: Run ETS tests