[Spice] Add version 0.19.4 (#6214)

Add version 0.19.4

Infra PR: compiler-explorer/infra#1249

etc/config/spice.amazon.properties

@@ -1,7 +1,7 @@
 compilers=&spice
-defaultCompiler=spice01903
+defaultCompiler=spice01904
 
-group.spice.compilers=spice01902:spice01903
+group.spice.compilers=spice01902:spice01903:spice01904
 group.spice.demangler=/opt/compiler-explorer/gcc-13.2.0/bin/c++filt
 group.spice.objdumper=/opt/compiler-explorer/gcc-13.2.0/bin/objdump
 group.spice.isSemVer=true
@@ -19,6 +19,8 @@ compiler.spice01902.exe=/opt/compiler-explorer/spice-0.19.2/spice
 compiler.spice01902.semver=0.19.2
 compiler.spice01903.exe=/opt/compiler-explorer/spice-0.19.3/spice
 compiler.spice01903.semver=0.19.3
+compiler.spice01904.exe=/opt/compiler-explorer/spice-0.19.4/spice
+compiler.spice01904.semver=0.19.4
 
 #################################
 #################################