Upgrade Spring Shell version to 3.4.1

Closes gh-1873

Author: mhalbritter

start-site/src/main/resources/application.yml

@@ -145,8 +145,8 @@ initializr:
         artifactId: spring-shell-dependencies
         versionProperty: spring-shell.version
         mappings:
-          - compatibilityRange: "[3.4.0,3.5.0-M1)"
-            version: 3.4.0
+          - compatibilityRange: "[3.4.0,4.0.0-M1)"
+            version: 3.4.1
       tanzu-scg-extensions:
         groupId: com.vmware.tanzu.springcloudgateway.extensions
         artifactId: extensions-bom
@@ -968,7 +968,7 @@ initializr:
           id: spring-shell
           groupId: org.springframework.shell
           artifactId: spring-shell-starter
-          compatibilityRange: "[3.4.0,3.5.0-M1)"
+          compatibilityRange: "[3.4.0,4.0.0-M1)"
           description: Build command line applications with spring.
           bom: spring-shell
           links:

start-site/src/test/java/io/spring/start/site/extension/dependency/springshell/SpringShellTestBuildCustomizerTests.java

@@ -32,7 +32,7 @@
  */
 class SpringShellTestBuildCustomizerTests extends AbstractExtensionTests {
 
-	private static final SupportedBootVersion BOOT_VERSION = SupportedBootVersion.V3_4;
+	private static final SupportedBootVersion BOOT_VERSION = SupportedBootVersion.latest();
 
 	@Test
 	void shellTestIsAddedWithSpringShell() {