Add @Nullable in doSetValue() in Argument[Type]PreparedStatementSetter

This commit adds @Nullable to the argValue parameters in the
doSetValue() methods in ArgumentPreparedStatementSetter and
ArgumentTypePreparedStatementSetter.

Closes gh-31086

spring-jdbc/src/main/java/org/springframework/jdbc/core/ArgumentPreparedStatementSetter.java

@@ -62,7 +62,9 @@ public class ArgumentPreparedStatementSetter implements PreparedStatementSetter,
 	 * @param argValue the value to set
 	 * @throws SQLException if thrown by PreparedStatement methods
 	 */
-	protected void doSetValue(PreparedStatement ps, int parameterPosition, Object argValue) throws SQLException {
+	protected void doSetValue(PreparedStatement ps, int parameterPosition, @Nullable Object argValue)
+			throws SQLException {
+
 		if (argValue instanceof SqlParameterValue paramValue) {
 			StatementCreatorUtils.setParameterValue(ps, parameterPosition, paramValue, paramValue.getValue());
 		}

spring-jdbc/src/main/java/org/springframework/jdbc/core/ArgumentTypePreparedStatementSetter.java

@@ -94,7 +94,7 @@ public class ArgumentTypePreparedStatementSetter implements PreparedStatementSet
 	 * @param argValue the argument value
 	 * @throws SQLException if thrown by PreparedStatement methods
 	 */
-	protected void doSetValue(PreparedStatement ps, int parameterPosition, int argType, Object argValue)
+	protected void doSetValue(PreparedStatement ps, int parameterPosition, int argType, @Nullable Object argValue)
 			throws SQLException {
 
 		StatementCreatorUtils.setParameterValue(ps, parameterPosition, argType, argValue);