Merge pull request #10 from tmshort/update-cert-mgr

Update Tilt cert-manager to v1.15.3

Author: everettraven

Tiltfile

@@ -5,7 +5,7 @@ load('ext://cert_manager', 'deploy_cert_manager')
 def deploy_cert_manager_if_needed():
     cert_manager_var = '__CERT_MANAGER__'
     if os.getenv(cert_manager_var) != '1':
-        deploy_cert_manager(version="v1.12.3")
+        deploy_cert_manager(version="v1.15.3")
         os.putenv(cert_manager_var, '1')