[hotfix] Fix maven property typo in root pom.xml

[RyanSkraba]

What is the purpose of the change

There's a missing brace in the root pom.xml that would ignore any tests that should be excluded on a specific JDK version (FailsOnJavaXxx) when the enable-adaptive-scheduler profile is enabled. There currently aren't any, but this should be corrected (and maybe backported)?

Brief change log

Add the missing brace.

Verifying this change

This change is a trivial rework without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not documented

[flinkbot]

CI report:

• 1eb406b Azure: SUCCESS

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[XComp]

Yikes, thanks for noticing.