[FIR] Fix Disappeared INVALID_CHARACTERS

^KT-59996 Fixed

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -3036,7 +3036,7 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = ResolvedToUnderscoreNamedCatchParameter::class
     }
 
-    interface InvalidCharacters : KtFirDiagnostic<KtNamedDeclaration> {
+    interface InvalidCharacters : KtFirDiagnostic<PsiElement> {
         override val diagnosticClass get() = InvalidCharacters::class
         val message: String
     }

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -3661,7 +3661,7 @@ internal class InvalidCharactersImpl(
     override val message: String,
     firDiagnostic: KtPsiDiagnostic,
     token: KtLifetimeToken,
-) : KtAbstractFirDiagnostic<KtNamedDeclaration>(firDiagnostic, token), KtFirDiagnostic.InvalidCharacters
+) : KtAbstractFirDiagnostic<PsiElement>(firDiagnostic, token), KtFirDiagnostic.InvalidCharacters
 
 internal class DangerousCharactersImpl(
     override val characters: String,