Use Haxe 4.3.4 on CI

Author: polybiusproxy

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Setup Haxe
         uses: krdlab/setup-haxe@master
         with:
-          haxe-version: latest
+          haxe-version: 4.3.4
 
       - name: Installing Dependencies
         if: matrix.os == 'ubuntu-latest'