build: Reinstate macOS CI builds of Comet with Spark 4.0

Author: manuzhang

.github/workflows/pr_build_macos.yml

@@ -57,11 +57,9 @@ jobs:
             java_version: "17"
             maven_opts: "-Pspark-3.5 -Pscala-2.13"
 
-            # TODO fails with OOM
-            # https://github.com/apache/datafusion-comet/issues/1949
-#          - name: "Spark 4.0, JDK 17, Scala 2.13"
-#            java_version: "17"
-#            maven_opts: "-Pspark-4.0 -Pscala-2.13"
+          - name: "Spark 4.0, JDK 17, Scala 2.13"
+            java_version: "17"
+            maven_opts: "-Pspark-4.0 -Pscala-2.13"
 
         suite:
           - name: "fuzz"