chore(pmd): remove stale suppressions of ImmutableField

Quote from https://pmd.github.io/2018/03/26/PMD-6.2.0/#modified-rules
%
The Java rule ImmutableField (java-design) now has a new ignoredAnnotations property that allows to
configure annotations that imply the method should be ignored. By default several lombok annotations
are ignored
%

Author: php-coder

src/main/java/ru/mystamps/web/feature/series/HttpURLConnectionDownloaderService.java

@@ -46,7 +46,7 @@ public class HttpURLConnectionDownloaderService implements DownloaderService {
 
 	// We don't support redirects because they allow to bypass some of our validations.
 	// FIXME: How exactly redirects can harm?
-	@SuppressWarnings({"PMD.RedundantFieldInitializer", "PMD.ImmutableField"})
+	@SuppressWarnings("PMD.RedundantFieldInitializer")
 	private boolean followRedirects = false;
 
 	// Only types listed here will be downloaded. For other types, INVALID_FILE_TYPE error

src/main/java/ru/mystamps/web/feature/series/importing/extractor/JsoupSiteParser.java

@@ -40,12 +40,7 @@
 @Getter(AccessLevel.PROTECTED)
 @Setter(AccessLevel.PROTECTED)
 @RequiredArgsConstructor(access = AccessLevel.PACKAGE)
-@SuppressWarnings({
-	"PMD.GodClass",
-	"PMD.TooManyMethods",
-	// the fields are effectively final but I keep them non-final to simplify testing
-	"PMD.ImmutableField"
-})
+@SuppressWarnings({"PMD.GodClass", "PMD.TooManyMethods"})
 public class JsoupSiteParser implements SiteParser {
 	private static final Logger LOG = LoggerFactory.getLogger(JsoupSiteParser.class);
 

src/main/java/ru/mystamps/web/feature/series/importing/extractor/SiteParserConfiguration.java

@@ -30,8 +30,6 @@
 @ToString
 @EqualsAndHashCode
 @RequiredArgsConstructor
-// optional fields can't be made final because they have setters
-@SuppressWarnings("PMD.ImmutableField")
 public class SiteParserConfiguration {
 	private final String name;
 	private final String matchedUrl;