Update actions

`book.multilingual` has been removed.
rust-lang/mdBook#2775

Author: daaa1k

.github/workflows/mdbook.yml

@@ -9,10 +9,10 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1
+        uses: peaceiris/actions-mdbook@v2
         with:
           mdbook-version: 'latest'
 
@@ -30,7 +30,7 @@ jobs:
       - run: mdbook build
 
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         if: github.ref == 'refs/heads/master'
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tests.yml

@@ -10,26 +10,26 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up PureScript toolchain
         uses: purescript-contrib/setup-purescript@main
 
       - name: Cache PureScript dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           key: ${{ runner.os }}-spago-${{ hashFiles('**/*.dhall') }}
           path: |
             exercises/*/.spago
             exercises/*/output
 
       - name: Set up Node toolchain
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
-          node-version: "14.x"
+          node-version: "24.x"
 
       - name: Cache NPM dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         env:
           cache-name: cache-node-modules
         with:

book.toml

@@ -1,7 +1,6 @@
 [book]
 authors = ["Phil Freeman"]
 language = "en"
-multilingual = false
 src = "text"
 title = "PureScript by Example"
 [output.html]