Make Namespaces.UseSpacing PSR-12 compatiable

From https://www.php-fig.org/psr/psr-12/:
The header of a PHP file may consist of a number of different blocks. If present, each of the blocks below MUST be separated by a single blank line

Author: alies-dev

IxDFCodingStandard/ruleset.xml

@@ -343,7 +343,11 @@
     </rule>
     <rule ref="SlevomatCodingStandard.Namespaces.UseDoesNotStartWithBackslash"/>
     <rule ref="SlevomatCodingStandard.Namespaces.UseFromSameNamespace"/>
-    <rule ref="SlevomatCodingStandard.Namespaces.UseSpacing"/>
+    <rule ref="SlevomatCodingStandard.Namespaces.UseSpacing">
+        <properties>
+            <property name="linesCountBetweenUseTypes" value="1"/>
+        </properties>
+    </rule>
     <rule ref="SlevomatCodingStandard.Namespaces.UselessAlias"/>
     <rule ref="SlevomatCodingStandard.Operators.DisallowEqualOperators"/>
     <rule ref="SlevomatCodingStandard.Operators.NegationOperatorSpacing"/>