Bump zombienet version `v1.3.91` (#2912)

This version includes
- Performance improvements.
- Minor fixes.

.gitlab/pipeline/zombienet.yml

 .zombienet-refs:
   extends: .build-refs
   variables:
-    ZOMBIENET_IMAGE: "docker.io/paritytech/zombienet:v1.3.86"
+    ZOMBIENET_IMAGE: "docker.io/paritytech/zombienet:v1.3.91"
 
 include:
   # substrate tests

polkadot/zombienet_tests/functional/0002-parachains-disputes.toml

@@ -5,7 +5,7 @@ timeout = 1000
   max_validators_per_core = 5
   needed_approvals = 8
 
-[relaychain.genesis.runtime.runtime_genesis_config.configuration.config.approval_voting_params]
+[relaychain.genesis.runtimeGenesis.patch.configuration.config.approval_voting_params]
   max_approval_coalesce_count = 5