Update SmallRye Config to 2.4.3

[radcortez]

https://github.com/smallrye/smallrye-config/releases/tag/2.4.3

Fixes #18823

[quarkus-bot]

Failing Jobs - Building 6ae3324

Status	Name	Step	Test failures	Logs	Raw logs
✔️	JVM Tests - JDK 11
✖	JVM Tests - JDK 11 Windows	Build	Test failures	Logs	Raw logs
✔️	JVM Tests - JDK 16

Full information is available in the Build summary check run.

Test Failures

⚙️ JVM Tests - JDK 11 Windows #

📦 extensions/hibernate-orm/deployment

✖ io.quarkus.hibernate.orm.sql_load_script.IntroducingDefaultImportScriptTestCase.testAddNewImportSql - More details - Source on GitHub

java.lang.RuntimeException: 
java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
	[error]: Build step io.quarkus.hibernate.orm.deployment.HibernateOrmProcessor#parsePersistenceXmlDescriptors threw an exception: java.lang.OutOfMemoryError: Metaspace
	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
	at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:445)
	at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:405)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:398)
	at org.jboss.logging.Logger.doGetMessageLogger(Logger.java:2562)
	at org.jboss.logging.Logger.getMessageLogger(Logger.java:2530)
	at org.jboss.logg...

[nastra]

LGTM

[gsmet]

@stuartwdouglas looks like we still have OOM errors on Windows. Must be some regression because it's fairly recent.