Add Crystal 1.12.1 (#6455)

<!-- THIS COMMENT IS INVISIBLE IN THE FINAL PR, BUT FEEL FREE TO REMOVE
IT
Thanks for taking the time to improve CE. We really appreciate it.
Before opening the PR, please make sure that the tests & linter pass
their checks,
  by running `make check`.
In the best case scenario, you are also adding tests to back up your
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etc/config/crystal.amazon.properties

@@ -1,7 +1,7 @@
 compilers=&crystal
-defaultCompiler=crystal1111
+defaultCompiler=crystal1121
 
-group.crystal.compilers=crystal1111:crystal1101:crystal192:crystal182:crystal173:crystal162:crystal151:crystal141:crystal132:crystal122:crystal11:crystal10:crystal036:crystal035:crystal034:crystal033:crystal032:crystal031:crystal030:crystal029
+group.crystal.compilers=crystal1121:crystal1111:crystal1101:crystal192:crystal182:crystal173:crystal162: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
@@ -11,8 +11,11 @@ group.crystal.compilerType=crystal
 group.crystal.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
 group.crystal.licenseLink=https://github.com/crystal-lang/crystal/blob/master/LICENSE
 group.crystal.licenseName=Apache 2
-group.crystal.licensePreamble=Copyright 2012-2023 Manas Technology Solutions.
+group.crystal.licensePreamble=Copyright 2012-2024 Manas Technology Solutions.
 
+compiler.crystal1121.semver=1.12.1
+compiler.crystal1121.exe=/opt/compiler-explorer/crystal-1.12.1/bin/crystal
+compiler.crystal1121.cc=/opt/compiler-explorer/gcc-snapshot/bin/gcc
 compiler.crystal1111.semver=1.11.1
 compiler.crystal1111.exe=/opt/compiler-explorer/crystal-1.11.1/bin/crystal
 compiler.crystal1111.cc=/opt/compiler-explorer/gcc-snapshot/bin/gcc