Fix create-release: add missing imports in trigger_and_wait_cache_build

Author: pepc84

scripts/create-release.py

@@ -81,7 +81,7 @@ def bump_version_files(tag):
 
 def trigger_and_wait_cache_build():
     """Trigger a new build-cache CI run and wait for it to complete."""
-    import time
+    import subprocess, json, time
     print("Triggering build-cache CI run...")
     r = subprocess.run(
         ["gh", "workflow", "run", "build-cache.yml", "--repo", repo],
@@ -152,7 +152,7 @@ def download_cache_artifacts():
 
 def trigger_and_wait_cache_build():
     """Trigger a new build-cache CI run and wait for it to complete."""
-    import time
+    import subprocess, json, time
     print("Triggering build-cache CI run...")
     r = subprocess.run(
         ["gh", "workflow", "run", "build-cache.yml", "--repo", repo],