[migration to Kotlin LV 2.3] Update Kotlin code w.r.t. KTLC-284 (1)

(trivial migrations w/ decreased null safety)

GitOrigin-RevId: 78d524a5a1905f5e44d14247ed68386af5a05324

Author: FenstonSingel

features-impl/common/src/com/jetbrains/ls/api/features/impl/common/rename/Renamer.kt

@@ -109,9 +109,9 @@ internal class Renamer(
 
                 for (entry in renames.entries) {
                     val usages =
-                        ReadAction.compute<Array<UsageInfo>?, RuntimeException?>(ThrowableComputable {
+                        ReadAction.compute<Array<UsageInfo>, RuntimeException>(ThrowableComputable {
                             RenameUtil.findUsages(
-                                entry.key!!, entry.value, refactoringScope,
+                                entry.key, entry.value, refactoringScope,
                                 searchInComments, searchTextOccurrences, allRenames
                             )
                         })