chore: upgrade GitHub Actions and fix related issues

Actions bumped to latest:
- actions/checkout: v4 → v6
- actions/setup-node: v4 → v6
- pnpm/action-setup: v4 → v6 (test job only; build job uses withastro/action)
- withastro/action: v0 → v6
- actions/deploy-pages: v1 → v5
- node-version: 18 → 24

Fixes alongside the upgrade:
- vitest v4: replace toContain() with toMatchObject() for plain object assertions
- pnpm/action-setup@v6 now requires explicit version; add version: latest to test job
- remove redundant pnpm/action-setup from build job (withastro/action@v6 handles it)

Author: ryuheechul

.github/workflows/gh-pages.yaml

@@ -16,11 +16,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout your repository using git
-        uses: actions/checkout@v3
-      - uses: pnpm/action-setup@v4
-      - uses: actions/setup-node@v3
+        uses: actions/checkout@v6
+      - uses: pnpm/action-setup@v6
         with:
-          node-version: 18
+          version: latest
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 24
           cache: 'pnpm'
       - run: pnpm install --frozen-lockfile
       - run: pnpm test
@@ -29,12 +31,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout your repository using git
-        uses: actions/checkout@v3
-      - uses: pnpm/action-setup@v4
+        uses: actions/checkout@v6
       - name: Install, build, and upload your site output
-        uses: withastro/action@v0
+        uses: withastro/action@v6
         with:
-            node-version: 18
+            node-version: 24
             package-manager: pnpm
   deploy:
     needs: build
@@ -45,4 +46,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v5

test/lib/ipv4.test.ts

@@ -3,46 +3,46 @@ import { calcHosts, calcIP, assemble, parseFrom } from '../../src/lib/ipv4';
 
 describe('parseFrom', () => {
   it('1.2.3.4/5', () => {
-    expect(parseFrom('1.2.3.4/5')).toContain({ address: assemble([1, 2, 3, 4]), prefix: 5 });
+    expect(parseFrom('1.2.3.4/5')).toMatchObject({ address: assemble([1, 2, 3, 4]), prefix: 5 });
   });
 
   it('255.255.255.255/32', () => {
-    expect(parseFrom('255.255.255.255/32')).toContain({
+    expect(parseFrom('255.255.255.255/32')).toMatchObject({
       address: assemble([255, 255, 255, 255]),
       prefix: 31, // because currently it refuses 32 and strongly suggests 31 instead
     });
   });
 
   it('255.255.255.255/33', () => {
-    expect(parseFrom('255.255.255.255/33')).toContain({
+    expect(parseFrom('255.255.255.255/33')).toMatchObject({
       address: -1,
       prefix: -1,
     });
   });
 
   it('256.255.255.255/32', () => {
-    expect(parseFrom('256.255.255.255/32')).toContain({
+    expect(parseFrom('256.255.255.255/32')).toMatchObject({
       address: -1,
       prefix: -1,
     });
   });
 
   it('255.256.255.255/32', () => {
-    expect(parseFrom('255.256.255.255/32')).toContain({
+    expect(parseFrom('255.256.255.255/32')).toMatchObject({
       address: -1,
       prefix: -1,
     });
   });
 
   it('255.255.256.255/32', () => {
-    expect(parseFrom('255.255.256.255/32')).toContain({
+    expect(parseFrom('255.255.256.255/32')).toMatchObject({
       address: -1,
       prefix: -1,
     });
   });
 
   it('255.255.255.256/32', () => {
-    expect(parseFrom('255.255.255.256/32')).toContain({
+    expect(parseFrom('255.255.255.256/32')).toMatchObject({
       address: -1,
       prefix: -1,
     });