Fix version conflict (#5192)

The version was bumped while this PR was in flight, giving us a semantic
merge conflict.

Author: michaelpj

plutus-benchmark/plutus-benchmark.cabal

@@ -247,8 +247,8 @@ test-suite plutus-benchmark-lists-tests
     , base                             >=4.9 && <5
     , lists-internal
     , plutus-benchmark-common
-    , plutus-core:plutus-core-testlib  ^>=1.1
-    , plutus-tx:plutus-tx-testlib      ^>=1.1
+    , plutus-core:plutus-core-testlib  ^>=1.2
+    , plutus-tx:plutus-tx-testlib      ^>=1.2
     , tasty
     , tasty-quickcheck