Remove a few unnecessary @NotNull annotations

Author: knutwannheden

src/main/java/org/openrewrite/kotlin/Assertions.java

@@ -17,7 +17,6 @@
 
 
 import org.intellij.lang.annotations.Language;
-import org.jetbrains.annotations.NotNull;
 import org.openrewrite.*;
 import org.openrewrite.internal.ThrowingConsumer;
 import org.openrewrite.internal.lang.Nullable;
@@ -248,7 +247,6 @@ public Space visitSpace(Space space, KSpace.Location loc, Integer integer) {
                     return next(space);
                 }
 
-                @NotNull
                 private Space next(Space space) {
                     if (!space.getComments().isEmpty()) {
                         return space;

src/main/java/org/openrewrite/kotlin/internal/PsiTreePrinter.java

@@ -17,7 +17,6 @@
 
 import lombok.AllArgsConstructor;
 import lombok.Data;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.KtFakeSourceElement;
 import org.jetbrains.kotlin.KtRealPsiSourceElement;
 import org.jetbrains.kotlin.KtSourceElement;
@@ -133,7 +132,7 @@ public static String printFirFile(FirFile file) {
         TreePrinterContext context = new TreePrinterContext(lines, 1);
         new FirDefaultVisitor<Void, TreePrinterContext>() {
             @Override
-            public Void visitElement(@NotNull FirElement firElement, TreePrinterContext ctx) {
+            public Void visitElement(FirElement firElement, TreePrinterContext ctx) {
                 StringBuilder line = new StringBuilder();
                 line.append(leftPadding(ctx.getDepth()))
                         .append(printFirElement(firElement));
@@ -164,7 +163,7 @@ public static String printFirTree(FirElement firElement) {
         TreePrinterContext context = new TreePrinterContext(lines, 1);
         new FirDefaultVisitor<Void, TreePrinterContext>() {
             @Override
-            public Void visitElement(@NotNull FirElement fir, TreePrinterContext ctx) {
+            public Void visitElement(FirElement fir, TreePrinterContext ctx) {
                 StringBuilder line = new StringBuilder();
                 line.append(leftPadding(ctx.getDepth()))
                         .append(printFirElement(fir));
@@ -190,7 +189,7 @@ public Void visitElement(@NotNull FirElement fir, TreePrinterContext ctx) {
     }
 
     public static class IrPrinter {
-        public void printElement(@NotNull IrElement element, @NotNull PsiTreePrinter.TreePrinterContext ctx) {
+        public void printElement(IrElement element, PsiTreePrinter.TreePrinterContext ctx) {
             StringBuilder line = new StringBuilder();
             line.append(leftPadding(ctx.getDepth()))
                     .append(printIrElement(element));