Build Equinox launcher for linux.x86_64 on debian-12

The image 'platformreleng-centos-swt-build:8' cannot be built anymore
and is therefore not updated.
Align with SWT and use the debian-12 image instead.

This will increase the GLIBC version requirement to version 2.34, see
eclipse-platform/eclipse.platform.swt#1422 (comment)

See also eclipse-platform/eclipse.platform.releng.aggregator#2441

Jenkinsfile

@@ -17,7 +17,7 @@ def runOnNativeBuildAgent(String platform, Closure body) {
 	def final nativeBuildStageName = 'Perform native launcher build'
 	if (platform == 'gtk.linux.x86_64') {
 		podTemplate(inheritFrom: 'basic' /* inherit general configuration */, containers: [
-			containerTemplate(name: 'launcherbuild', image: 'eclipse/platformreleng-centos-swt-build:8',
+			containerTemplate(name: 'launcherbuild', image: 'eclipse/platformreleng-debian-swtnativebuild:12',
 				resourceRequestCpu:'1000m', resourceRequestMemory:'512Mi',
 				resourceLimitCpu:'2000m', resourceLimitMemory:'4096Mi',
 				alwaysPullImage: true, command: 'cat', ttyEnabled: true)