Upgrade Checkstyle 13.2.0 -> 13.3.0 (#2128)

While there, enable the new `GoogleNonConstantFieldName` and
`UseEnhancedSwitch` checks.

See:
- https://checkstyle.sourceforge.io/releasenotes.html
- https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.3.0
- checkstyle/checkstyle@checkstyle-13.2.0...checkstyle-13.3.0

Author: Picnic-DevPla-Bot

pom.xml

@@ -738,6 +738,7 @@
                                     </module>
                                     <module name="EmptyStatement" />
                                     <module name="FinalClass" />
+                                    <module name="GoogleNonConstantFieldName" />
                                     <module name="HiddenField">
                                         <property name="ignoreConstructorParameter" value="true" />
                                         <property name="ignoreSetter" value="true" />
@@ -883,6 +884,7 @@
                                         but (currently) doesn't warn about
                                         JavaDoc-only imports. -->
                                     </module>
+                                    <module name="UseEnhancedSwitch" />
                                     <module name="VisibilityModifier" />
                                     <module name="WhenShouldBeUsed" />
                                 </module>
@@ -906,7 +908,7 @@
                         <dependency>
                             <groupId>com.puppycrawl.tools</groupId>
                             <artifactId>checkstyle</artifactId>
-                            <version>13.2.0</version>
+                            <version>13.3.0</version>
                         </dependency>
                         <dependency>
                             <groupId>io.spring.nohttp</groupId>