[ci] Enable VecCore

Author: guitargeek

.github/workflows/root-ci-config/buildconfig/global.txt

@@ -26,7 +26,7 @@ builtin_tbb=OFF
 builtin_unuran=OFF
 builtin_vc=OFF
 builtin_vdt=OFF
-builtin_veccore=OFF
+builtin_veccore=ON
 builtin_xrootd=OFF
 builtin_xxhash=OFF
 builtin_zeromq=ON
@@ -99,7 +99,7 @@ unuran=ON
 uring=OFF
 vc=OFF
 vdt=ON
-veccore=OFF
+veccore=ON
 vecgeom=OFF
 webgui=ON
 win_broken_tests=OFF