ci: use zig 0.15.1

Author: hendriknielaender

.github/workflows/zig.yml

@@ -18,14 +18,14 @@ jobs:
       - uses: actions/checkout@v4
       - uses: mlugg/setup-zig@v2
         with:
-          version: 0.14.1
+          version: 0.15.1
       - run: zig build test
   lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: mlugg/setup-zig@v2
         with:
-          version: 0.14.1
+          version: 0.15.1
       - run: zig fmt --check src/*.zig
-      - uses: DonIsaac/zlint-action@v0
+      - uses: DonIsaac/zlint-action@v0