Fix tests: use VoxelArea with Mineunit

.github/workflows/mineunit.yml

@@ -14,6 +14,7 @@ jobs:
       uses: mt-mods/mineunit-actions@master
       with:
         working-directory: ./technic
+        mineunit-args: --fetch-core 5.4.1 --engine-version 5.4.1
         badge-label: Test coverage
 
     - uses: RubbaBoy/BYOB@v1.2.0

technic/spec/fixtures/technic.lua

@@ -9,6 +9,9 @@ mineunit("protection")
 mineunit("common/after")
 mineunit("server")
 mineunit("voxelmanip")
+if mineunit:config("engine_version") ~= "mineunit" then
+	mineunit("game/voxelarea")
+end
 
 -- Load fixtures required by tests
 fixture("default")