update pmd and checkstyle configs:

checkstyle MultipleStringLiterals - change defauilt
pmd AvoidAccessibilityAlteration and ReturnEmptyArrayRatherThanNull disabled
pmd CognitiveComplexity change default

CHANGELOG.md

@@ -7,7 +7,13 @@
     Option might be used to force backport for java >=11 or to disable backport at all
 * Update checkstyle config:
     - Add [UnusedLocalVariable](https://checkstyle.sourceforge.io/config_coding.html#UnusedLocalVariable)
+    - Change [MultipleStringLiterals](https://checkstyle.org/config_coding.html#MultipleStringLiterals) 
+      to react on strings more than 2 chars only and allow 2 duplicates (to avoid warning in trivial cases)
 * Update pmd 6.34 -> 6.47 (java 17-18 support)
+* Update pmd config:
+    - Disable [AvoidAccessibilityAlteration](https://pmd.github.io/pmd-6.47.0/pmd_rules_java_errorprone.html#avoidaccessibilityalteration)
+    - Change [CognitiveComplexity](https://pmd.github.io/pmd-6.47.0/pmd_rules_java_design.html#cognitivecomplexity) reportLevel to 21 (default 15)
+    - Disable [ReturnEmptyArrayRatherThanNull](https://pmd.github.io/pmd-6.47.0/pmd_rules_java_errorprone.html#returnemptyarrayratherthannull) as deprecated
 * Update codenarc 2.2.0 -> 3.1.0  (groovy 4 support)
 * New option: quality.codenarcGroovy4 (by default, true)
     Since codenarc 3.1 separate groovy4-based codenarc jar produced (codenarc-groovy4)

src/main/resources/ru/vyarus/quality/config/checkstyle/checkstyle.xml

@@ -94,7 +94,10 @@
         <!--<module name="MissingCtor"/>-->
         <module name="MissingSwitchDefault"/>
         <module name="ModifiedControlVariable"/>
-        <module name="MultipleStringLiterals"/>
+        <module name="MultipleStringLiterals">
+            <property name="allowedDuplicates" value="2"/>
+            <property name="ignoreStringsRegexp" value='^".{0,2}"$'/>
+        </module>
         <module name="MultipleVariableDeclarations"/>
         <module name="NestedForDepth">
             <property name="max" value="2"/>

src/main/resources/ru/vyarus/quality/config/pmd/pmd.xml

@@ -75,6 +75,11 @@
             <property name="problemDepth" value="4"/>
         </properties>
     </rule>
+    <rule ref="category/java/design.xml/CognitiveComplexity">
+        <properties>
+            <property name="reportLevel" value="21"/>
+        </properties>
+    </rule>
     <rule ref="category/java/design.xml/CyclomaticComplexity">
         <properties>
             <property name="cycloOptions" value="ignoreBooleanPaths"/>
@@ -110,6 +115,7 @@
     <!-- Error prone (https://pmd.github.io/pmd-6.0.1/pmd_rules_java_errorprone.html) -->
     <rule ref="category/java/errorprone.xml">
         <exclude name="AssignmentInOperand"/>
+        <exclude name="AvoidAccessibilityAlteration"/>
         <exclude name="AvoidCatchingThrowable"/>
         <exclude name="BeanMembersShouldSerialize"/>
         <exclude name="DataflowAnomalyAnalysis"/>
@@ -124,6 +130,7 @@
         <exclude name="LoggerIsNotStaticFinal"/>
         <exclude name="MissingSerialVersionUID"/>
         <exclude name="NullAssignment"/> <!-- disabled due to false positive for initialization with ternary operator -->
+        <exclude name="ReturnEmptyArrayRatherThanNull"/>
         <exclude name="StaticEJBFieldShouldBeFinal"/> <!-- earlier j2ee group-->
         <exclude name="UseCorrectExceptionLogging"/>
         <exclude name="UseLocaleWithCaseConversions"/>