Fix incorrect Spring Boot version (#269)

Author: rashidi

README.adoc

@@ -9,7 +9,7 @@ Spring Data, Spring Batch, Spring Cloud, Spring Security, Spring GraphQL, and Sp
 with source code in individual submodules and can be found on {url-quickref}[GitHub].
 
 image:https://img.shields.io/badge/Java_-21-blue?style=flat-square[Static Badge]
-image:https://img.shields.io/gradle-plugin-portal/v/org.springframework.boot?style=flat-square&logo=springboot&label=Spring%20Boot[Gradle Plugin Portal Version]
+image:https://img.shields.io/badge/Spring_Boot-3.5.4-blue?style=flat-square&logo=springboot[Spring Boot version]
 image:https://img.shields.io/github/license/rashidi/spring-boot-tutorials?style=flat-square&color=blue[GitHub License]
 image:https://img.shields.io/github/actions/workflow/status/rashidi/spring-boot-tutorials/gradle-build.yml?style=flat-square&logo=githubactions&color=blue[Gradle Build]
 image:https://img.shields.io/sonar/coverage/rashidi_spring-boot-tutorials?server=https%3A%2F%2Fsonarcloud.io&style=flat-square&color=blue[Sonar Coverage]
@@ -69,3 +69,4 @@ All tutorials are documented in AsciiDoc format and published as an https://anto
 |link:web-thymeleaf-xss[Spring Web: Preventing XSS with Thymeleaf] |Prevent Cross-Site Scripting (XSS) attacks in Spring Boot applications using Spring Security and Thymeleaf
 |link:modulith[Spring Modulith: Building Modular Monolithic Applications] | Structure Spring Boot applications into well-defined modules with clear boundaries
 |===
+

supplemental-ui/partials/footer-content.hbs

@@ -2,6 +2,6 @@
     <p>Spring Boot Tutorials by <a href="https://about.me/rashidi.zin">Rashidi Zin</a></p>
     <p id="badges">
         <img alt="Java version" src="https://img.shields.io/badge/Java_-21-blue?style=flat-square" />
-        <img alt="Spring Boot version" src="https://img.shields.io/gradle-plugin-portal/v/org.springframework.boot?style=flat-square&logo=springboot&label=Spring%20Boot" />
+        <img alt="Spring Boot version" src="https://img.shields.io/badge/Spring_Boot-3.5.4-blue?style=flat-square&logo=springboot" />
         <img alt="License - Unlicense" src="https://img.shields.io/github/license/rashidi/spring-boot-tutorials?style=flat-square&color=blue" />
-</footer>
+</footer>