chore: remove stale path of expected.h from licenserc.yaml (#425)

we no longer self-maintain expected.h, better to remove

Author: zhjwpku

.github/.licenserc.yaml

@@ -29,7 +29,6 @@ header:
     - 'LICENSE'
     - 'NOTICE'
     - 'requirements.txt'
-    - 'src/iceberg/expected.h'
     - 'src/iceberg/util/murmurhash3_internal.*'
     - 'src/iceberg/test/resources/**'