add 1.12.2 to the build script

.gitlab-ci.yml

@@ -41,7 +41,8 @@ build:
       "1.19.4", "1.19.2",
       "1.18.2", 
       "1.17.1", 
-      "1.16.5"
+      "1.16.5",
+      "1.12.2"
       ]
   script:
     # this both runs the unit tests and assembles the code

gradle.properties

@@ -48,7 +48,7 @@ versionStr=
 
 # This defines what MC version Intellij will use for the preprocessor
 # and what version is used automatically by build and run commands
-mcVer=1.12.2
+mcVer=26.1.2
 
 # Defines the maximum amount of memory Minecraft is allowed when run in a development environment
 minecraftMemoryJavaArg=-Xmx6G