GP-170 Upgrade to Spring 6

* upgrade to Spring 6
* upgrade to Jakarta Servlet API 6
* upgrade other libs
* cleanup pom.xml files
* remove empty modules
* remove legacy view-resolver exercise

Author: tboychuk

2-0-servlet-api/pom.xml

@@ -20,7 +20,7 @@
         <dependency>
             <groupId>jakarta.servlet</groupId>
             <artifactId>jakarta.servlet-api</artifactId>
-            <version>5.0.0</version>
+            <version>6.0.0</version>
             <scope>provided</scope>
         </dependency>
     </dependencies>

3-0-spring-framework/3-0-0-hello-spring-framework/pom.xml

@@ -12,11 +12,6 @@
     <artifactId>3-0-0-hello-spring-framework</artifactId>
 
     <dependencies>
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-context</artifactId>
-            <version>5.3.23</version>
-        </dependency>
         <dependency>
             <groupId>com.bobocode</groupId>
             <artifactId>spring-framework-exercises-util</artifactId>

3-0-spring-framework/3-0-1-hello-spring-mvc/pom.xml

@@ -15,20 +15,20 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
-            <version>2.7.3</version>
+            <version>3.0.1</version>
         </dependency>
 
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
-            <version>2.7.3</version>
+            <version>3.0.1</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-thymeleaf</artifactId>
-            <version>2.7.3</version>
+            <version>3.0.1</version>
         </dependency>
 
     </dependencies>