Revert maven-site-plugin to 3.x release, upgrade spotless, and fluido

plugins.

pom.xml

@@ -1019,7 +1019,7 @@
                 <!-- Note: This uses the maven-fluido-skin version specified next. The skin is referenced in src/site/site.xml. -->
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-site-plugin</artifactId>
-                <version>4.0.0-M16</version>
+                <version>3.21.0</version>
                 <dependencies>
                     <!-- Explicitly declare these dependencies so the versions plugin and library bots will flag available updates. The fluido-skin plugin is referenced in src/site/site.xml using the same fluido version property. -->
                     <dependency>
@@ -1099,7 +1099,7 @@
             <plugin>
                 <groupId>com.diffplug.spotless</groupId>
                 <artifactId>spotless-maven-plugin</artifactId>
-                <version>2.44.0</version>
+                <version>2.44.1</version>
                 <configuration>
                     <!-- optional: limit format enforcement to just the files changed by this feature branch -->
                     <ratchetFrom>origin/master</ratchetFrom>
@@ -1241,7 +1241,7 @@
 
         <version.apache.api-ldap>2.1.7</version.apache.api-ldap>
         <version.apacheds>2.0.0.AM27</version.apacheds>
-        <version.fluido>2.0.0-M11</version.fluido>
+        <version.fluido>2.0.1</version.fluido>
         <!-- hibernate is up to rev 6+. But 4.0.0. causes this error: symbol: org.hibernate.classic.Session not found -->
         <version.hibernate>3.6.10.Final</version.hibernate>
         <version.spotbugs.maven>4.8.6.6</version.spotbugs.maven>