ci: update to ninja 1.12.1

This version has prebuilt binaries for Linux aarch64 available.

.gitlab/ci/ninja.sh

@@ -2,12 +2,12 @@
 
 set -e
 
-readonly version="1.10.2"
+readonly version="1.12.1"
 
 case "$( uname -s )-$( uname -m )" in
     Linux-x86_64)
         shatool="sha256sum"
-        sha256sum="763464859c7ef2ea3a0a10f4df40d2025d3bb9438fcb1228404640410c0ec22d"
+        sha256sum="6f98805688d19672bd699fbbfa2c2cf0fc054ac3df1f0e6a47664d963d530255"
         platform="linux"
         ;;
     Linux-aarch64)
@@ -17,7 +17,7 @@ case "$( uname -s )-$( uname -m )" in
         ;;
     Darwin-*)
         shatool="shasum -a 256"
-        sha256sum="6fa359f491fac7e5185273c6421a000eea6a2f0febf0ac03ac900bd4d80ed2a5"
+        sha256sum="89a287444b5b3e98f88a945afa50ce937b8ffd1dcc59c555ad9b1baf855298c9"
         platform="mac"
         ;;
     *)