Increase PR concurrent limit to 20 (#5948)

Increases the Renovate `prConcurrentLimit` from the default 10 to 20 this allows more concurrent dependency update PRs helping to address updates more quickly as discussed in the sig

Signed-off-by: Ayush More <[email protected]>

Author: Ayushmore1214

.github/renovate.json

@@ -7,6 +7,7 @@
     "group:test",
     ":preserveSemverRanges"
   ],
+  "prConcurrentLimit": 20,
   "ignorePresets": [":pinDevDependencies", ":pinDigest", "docker:pinDigests"],
   "labels": ["dependencies"],
   "postUpdateOptions": ["yarnDedupeHighest"],