refactor(.github/workflows): move to zig 0.15.2

Author: guidoschmidt

.github/workflows/build.yml

@@ -18,9 +18,9 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Zig
-        uses: goto-bus-stop/setup-zig@v1
+        uses: mlugg/setup-zig@v2
         with:
-          version: 0.14.0
+          version: 0.15.2
 
       - name: Compile all solutions for current year
         run: zig build

.zigversion

@@ -1 +1 @@
-0.15.1
+0.15.2