chore: add missing SLF4J concrete library to IT modules (#8133)

Author: DiegoCardoso

vaadin-board-flow-parent/vaadin-board-flow-integration-tests/pom.xml

@@ -63,6 +63,10 @@
             <groupId>jakarta.servlet</groupId>
             <artifactId>jakarta.servlet-api</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

vaadin-confirm-dialog-flow-parent/vaadin-confirm-dialog-flow-integration-tests/pom.xml

@@ -89,6 +89,10 @@
             <groupId>jakarta.servlet</groupId>
             <artifactId>jakarta.servlet-api</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

vaadin-map-flow-parent/vaadin-map-flow-integration-tests/pom.xml

@@ -68,6 +68,10 @@
             <groupId>jakarta.servlet</groupId>
             <artifactId>jakarta.servlet-api</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+        </dependency>
     </dependencies>
     <build>
         <plugins>