model: use correct "replication_performance_mode" JSON field

The official docs incorrectly state "replication_perf_mode" which was
renamed to "replication_performance_mode" way back in Vault 0.9. We now
use the correct field name that is emitted by the API.

.github/workflows/ci.yml

@@ -6,10 +6,10 @@ jobs:
     strategy:
       matrix:
         jdk: [ 11, 17 ]
-        vault: [ '1.9.0' ]
+        vault: [ '1.9.2' ]
         include:
           - jdk: 11
-            vault: '1.9.0'
+            vault: '1.9.2'
             analysis: true
     steps:
       - name: Checkout