KT-42274 Update SOURCE_STUB_VERSION

This update should have been done in
4b7d34b537 commit, as it is stated in the
`KtTokens.MODIFIER_KEYWORDS_ARRAY` docs.

Shifting all modifiers by one have led resulted in incorrect modifiers
when stubs were read from the disk. Updating `SOURCE_STUB_VERSION` will
make IDEA recreate all stubs from scratch

^KT-42274 Fixed

compiler/psi/src/org/jetbrains/kotlin/psi/stubs/KotlinStubVersions.kt

@@ -23,7 +23,7 @@ object KotlinStubVersions {
     // Though only kotlin declarations (no code in the bodies) are stubbed, please do increase this version
     //      if you are not 100% sure it can be avoided.
     // Increasing this version will lead to reindexing of all kotlin source files on the first IDE startup with the new version.
-    const val SOURCE_STUB_VERSION = 137
+    const val SOURCE_STUB_VERSION = 138
 
     // Binary stub version should be increased if stub format (org.jetbrains.kotlin.psi.stubs.impl) is changed
     //      or changes are made to the core stub building code (org.jetbrains.kotlin.idea.decompiler.stubBuilder).