Polish "Remove unnecessary @Nullables from local variable declarations"

See gh-50866

Author: wilkinsona

core/spring-boot/src/main/java/org/springframework/boot/json/BasicJsonParser.java

@@ -82,7 +82,7 @@ private Map<String, Object> parseMapInternal(int nesting, String json) {
 		Map<String, Object> map = new LinkedHashMap<>();
 		json = trimEdges(json, '{', '}').trim();
 		for (String pair : tokenize(json)) {
-			String @Nullable [] split = StringUtils.split(pair, ":");
+			String[] split = StringUtils.split(pair, ":");
 			Assert.state(split != null, () -> "Unable to parse '%s'".formatted(pair));
 			@Nullable String[] rawElement = StringUtils.trimArrayElements(split);
 			String rawKey = rawElement[0];