Remove accidentally added license files (#50370)

As license infos and sha files belong to the licenses/ folder, these
files seem to have been added accidentally some time ago.

plugins/analysis-icu/bin/licenses/icu4j-59.1.jar.sha1

@@ -1 +0,0 @@
-6f06e820cf4c8968bbbaae66ae0b33f6a256b57f

plugins/analysis-icu/bin/licenses/lucene-analyzers-icu-7.0.0-snapshot-ad2cb77.jar.sha1

@@ -1 +0,0 @@
-f90e2fe9e8ff1be65a800e719d2a25cd0a09cced