meta: add startup team in CODEOWNERS

PR-URL: #35406
Fixes: #35215
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

.github/CODEOWNERS

@@ -98,3 +98,13 @@
 /src/node_wasi* @nodejs/wasi
 /test/wasi/ @nodejs/wasi
 /test/fixtures/wasi/ @nodejs/wasi
+
+# Startup
+
+/benchmark/misc/startup.js @nodejs/startup
+/src/node.cc @nodejs/startup
+/src/node_code_cache_stub.cc @nodejs/startup
+/src/node_native_module* @nodejs/startup
+/lib/internal/bootstrap/* @nodejs/startup
+/tools/code_cache/* @nodejs/startup
+/tools/snapshot/* @nodejs/startup