Update Crystal 1.6.0 -> 1.6.1 (compiler-explorer#4216)

Author: HertzDevil

etc/config/crystal.amazon.properties

@@ -1,7 +1,7 @@
 compilers=&crystal
-defaultCompiler=crystal160
+defaultCompiler=crystal161
 
-group.crystal.compilers=crystal160:crystal151:crystal141:crystal132:crystal122:crystal11:crystal10:crystal036:crystal035:crystal034:crystal033:crystal032:crystal031:crystal030:crystal029
+group.crystal.compilers=crystal161:crystal151:crystal141:crystal132:crystal122:crystal11:crystal10:crystal036:crystal035:crystal034:crystal033:crystal032:crystal031:crystal030:crystal029
 group.crystal.isSemVer=true
 group.crystal.baseName=Crystal
 group.crystal.groupName=Crystal x86-64
@@ -10,9 +10,10 @@ group.crystal.supportsExecute=true
 group.crystal.compilerType=crystal
 group.crystal.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
 
-compiler.crystal160.semver=1.6.0
-compiler.crystal160.exe=/opt/compiler-explorer/crystal-1.6.0/bin/crystal
-compiler.crystal160.cc=/opt/compiler-explorer/gcc-snapshot/bin/gcc
+compiler.crystal161.semver=1.6.1
+compiler.crystal161.exe=/opt/compiler-explorer/crystal-1.6.1/bin/crystal
+compiler.crystal161.cc=/opt/compiler-explorer/gcc-snapshot/bin/gcc
+compiler.crystal161.alias=crystal160
 compiler.crystal151.semver=1.5.1
 compiler.crystal151.exe=/opt/compiler-explorer/crystal-1.5.1/bin/crystal
 compiler.crystal151.cc=/opt/compiler-explorer/gcc-snapshot/bin/gcc