ciimage/arch: don't force java to be 1.8

Parent introduced unit test (9 jni) that depends on at least java 9,
thus causing the test to be skipped.

ci/ciimage/arch/install.sh

@@ -11,7 +11,7 @@ pkgs=(
   ninja make git sudo fakeroot autoconf automake patch
   libelf gcc gcc-fortran gcc-objc vala rust bison flex cython go dlang-dmd
   mono boost qt5-base gtkmm3 gtest gmock protobuf gobject-introspection
-  itstool gtk3 java-environment=8 gtk-doc llvm clang sdl2 graphviz
+  itstool gtk3 java-environment gtk-doc llvm clang sdl2 graphviz
   doxygen vulkan-validation-layers openssh mercurial gtk-sharp-2 qt5-tools
   libwmf cmake netcdf-fortran openmpi nasm gnustep-base gettext
   python-lxml hotdoc rust-bindgen qt6-base qt6-tools wayland wayland-protocols