test: skip external-exceed-max-by-1-hex on AIX
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-1-hex is failing regularly on AIX. Skip for now.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines