Pin KSPBT workflow versions (#41)

Author: drewcassidy

.github/workflows/build.yml

@@ -13,4 +13,4 @@ on:
 
 jobs:
   build:
-    uses: KSPModdingLibs/KSPBuildTools/.github/workflows/build.yml@main
+    uses: KSPModdingLibs/KSPBuildTools/.github/workflows/build.yml@0.0.4