bench workflow: wait up to 10 minutes for a new version on npm

3.6.0 wasn't installable 2.5 minutes after publishing, so the bench job
failed until it was rerun.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lfv41PqHEGbU7SLg5onpG1

Author: matmen

.github/workflows/bench.yml

@@ -39,11 +39,11 @@ jobs:
         node-version: 24.x
 
     - run: npm ci --no-audit --no-fund
-    # a version that was just published can take a moment to show up on the registry; npm ci cached the package's
-    # versions from before, which --prefer-online skips
+    # a version that was just published can take some minutes to show up on the registry (3.6.0 took more than 2.5);
+    # npm ci cached the package's versions from before, which --prefer-online skips
     - if: inputs.version != ''
       run: |
-        for attempt in 1 2 3 4 5; do
+        for attempt in $(seq 20); do
           npm install --save-exact --prefer-online --no-audit --no-fund "imagescript@$VERSION" && exit 0
           sleep 30
         done