Switch to JDT LS 1.45 and Java 21

eclipse-distribution/org.springframework.boot.ide.branding/plugin.properties

@@ -4,9 +4,9 @@ providerName=Broadcom
 productName=Spring Tool Suite 4
 productBlurb=Spring Tool Suite 4 \n\
 \n\
-Version: @QUALIFIER@\n\
-Build Id: @BUILD_ID@\n\
-Revision: @REVISION@\n\
+Version: 4.30.0.202503130220-SNAPSHOT\n\
+Build Id: 202503130220\n\
+Revision: cd3bbb9302898f21e5b7cd8872e0bac2b2ccbb89\n\
 \n\
 Copyright (c) 2007 - 2025 Broadcom\n\
 All rights reserved. Visit https://spring.io/tools\n\
@@ -17,5 +17,5 @@ Eclipse Foundation https://www.eclipse.org\n\
 This product includes software developed by the\n\
 Apache Software Foundation https://www.apache.org
 
-productIntroTitle = Welcome to Spring Tool Suite 4 @QUALIFIER@
+productIntroTitle = Welcome to Spring Tool Suite 4 4.30.0.202503130220-SNAPSHOT
 productIntroBrandingText = Spring Tool Suite 4