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32b444c0540e8255cc216171aba57639903edc22 by CJ Johnson <johnsoncj@google.com>:

Add missing `final` to `absl::Cleanup` since it is not an interface type and should never be used as a base class.

PiperOrigin-RevId: 359045692
GitOrigin-RevId: 32b444c0540e8255cc216171aba57639903edc22
Change-Id: I4f72714cd6f2e101709f31958af28b358f15646b