chore: bump deps

.github/workflows/ci.yml

@@ -27,21 +27,21 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        zig: [0.13.0, master]
+        zig: [0.13.0]
     steps:
       - uses: actions/checkout@v4
-      - uses: goto-bus-stop/setup-zig@v2
+      - uses: mlugg/setup-zig@v1
         with:
-          version: ${{ matrix.zig }}
+          version: ${{ matrix.zig-version }}
       - name: Start services
-        uses: ikalnytskyi/action-setup-postgres@v6
+        uses: ikalnytskyi/action-setup-postgres@v7
         with:
           username: postgres
           password: postgres
           database: postgres
           port: 5432
       - name: mysql for ubuntu
-        uses: mirromutth/mysql-action@v1.1
+        uses: mirromutth/mysql-action@v1
         if: matrix.os == 'ubuntu-latest'
         with:
           character set server: 'utf8'

.github/workflows/pages.yml

@@ -39,7 +39,7 @@ jobs:
           fi
           mdbook build
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           path: ./book
 
@@ -52,4 +52,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v3
+        uses: actions/deploy-pages@v4

src/07-04.zig

@@ -1,5 +1,4 @@
 const std = @import("std");
-const builtin = @import("builtin");
 
 var n: u8 = 0;
 
@@ -8,7 +7,9 @@ fn incr() void {
 }
 
 var once_incr = std.once(incr);
+
 fn onceIncr() void {
+    // The invocations of `call` are thread-safe.
     once_incr.call();
     once_incr.call();
 }