[mlir] Fix c++20 compat warning. NFC. (#65801)
`concept` is a c++20 keyword and makes some buildbots fail: https://lab.llvm.org/buildbot/#/builders/160/builds/24345
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`concept` is a c++20 keyword and makes some buildbots fail: https://lab.llvm.org/buildbot/#/builders/160/builds/24345