Use mdbook-linkcheck2.

mdbook-linkcheck hasn't had a release in 2 years and doesn't support
Rust 2024 edition.

.github/workflows/build.yml

@@ -161,9 +161,9 @@ jobs:
           MDBOOK_OUTPUT='{"xgettext": {"pot-file": "messages.pot"}}' mdbook build -d po
           msgfmt -o /dev/null --statistics po/messages.pot
 
-      - name: Install mdbook-linkcheck
+      - name: Install mdbook-linkcheck2
         if: contains(fromJSON(env.LINK_CHECKED_LANGUAGES), matrix.language)
-        run: cargo install mdbook-linkcheck --locked --version 0.7.7
+        run: cargo install mdbook-linkcheck2 --locked --version 0.9.1
 
       - name: Build ${{ matrix.language }} translation
         run: |

README.md

@@ -57,7 +57,7 @@ The course is built using a few tools:
 - [mdbook-course](mdbook-course/)
 
 In addition,
-[mdbook-linkcheck](https://github.com/Michael-F-Bryan/mdbook-linkcheck) checks
+[mdbook-linkcheck2](https://github.com/marxin/mdbook-linkcheck2) checks
 the internal links.
 
 First install Rust by following the instructions on https://rustup.rs/. Then

book.toml

@@ -291,7 +291,7 @@ use-boolean-and = true
 [output.exerciser]
 output-directory = "comprehensive-rust-exercises"
 
-[output.linkcheck]
+[output.linkcheck2]
 optional = true
 follow-web-links = false # change to true to check web links
 exclude = [