platform_configs: rename qtbase-new-compiler-testing

to follow the syntax like others.

Pick-to: 6.10 6.8
Change-Id: I64ce1b62d6a1caace624acd36c17be02005156c5
Reviewed-by: Tero Heikkinen <tero.heikkinen@qt.io>

coin/platform_configs/qtbase.yaml

@@ -10,7 +10,7 @@ Include: [
     cmake_platforms_qemu_vxworks_buildtest_static.yaml,
     cmake_platforms_qemu_vxworks_tests_static.yaml,
     qtlite.yaml,
-    qtbase-new-compiler-testing.yaml,
+    qtbase_new_compiler_testing.yaml,
     quick-minimal.yaml,
     quick-bridges.yaml
 ]