chore: set prConcurrentLimit to zero

Signed-off-by: Ian Lewis <ian@ianlewis.org>

Author: ianlewis

renovate.json5

@@ -22,7 +22,9 @@
   // NOTE: Set the prHourlyLimit to 0 to disable the hourly limit. This is done
   // because we are using a monthly schedule and the default hourly limit of 2
   // would cause Renovate to only create 2 PRs every month.
+  // Similarly set prConcurrentLimit to 0 to disable the concurrent PR limit.
   prHourlyLimit: 0,
+  prConcurrentLimit: 0,
 
   // Security alerts/updates.
   vulnerabilityAlerts: {