Update squizlabs/php_codesniffer to 4.0

Author: andrii-pez

Swivl/ruleset.xml

@@ -69,8 +69,6 @@
         </properties>
     </rule>
 
-    <rule ref="Generic.Functions.CallTimePassByReference"/>
-
     <rule ref="Generic.Metrics.NestingLevel">
         <properties>
             <property name="nestingLevel" value="6"/>
@@ -271,7 +269,6 @@
             <property name="spacingAfterLast" value="0"/>
         </properties>
     </rule>
-    <rule ref="Squiz.WhiteSpace.LanguageConstructSpacing"/>
     <rule ref="Squiz.WhiteSpace.LogicalOperatorSpacing"/>
     <rule ref="Squiz.WhiteSpace.MemberVarSpacing">
         <properties>

Swivl/slevomat.xml

@@ -295,7 +295,7 @@
             <property name="spacesCountBeforeColon" value="0"/>
         </properties>
     </rule>
-    <rule ref="SlevomatCodingStandard.TypeHints.UnionTypeHintFormat">
+    <rule ref="SlevomatCodingStandard.TypeHints.DNFTypeHintFormat">
         <properties>
             <property name="withSpaces" value="no"/>
             <property name="nullPosition" value="last"/>

composer.json

@@ -14,8 +14,8 @@
         }
     ],
     "require": {
-        "php": ">=7.1",
-        "squizlabs/php_codesniffer": "^3.6"
+        "php": ">=7.2",
+        "squizlabs/php_codesniffer": "^4.0"
     },
     "conflict": {
         "doctrine/orm": "<2.9"