Bump org.webjars:bootstrap from 4.3.1 to 5.3.8 (#23)

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -39,7 +39,7 @@ org-springframework-boot-spring-boot-starter-thymeleaf = "3.5.6"
 org-springframework-boot-spring-boot-starter-validation = "3.3.4"
 org-springframework-boot-spring-boot-starter-web = "3.5.6"
 org-springframework-security-spring-security-test = "6.3.3"
-org-webjars-bootstrap = "4.3.1"
+org-webjars-bootstrap = "5.3.8"
 org-webjars-jquery = "3.7.1"
 org-webjars-webjars-locator-core = "0.58"