Pin just version in CI

Author: tobiasraabe

.github/workflows/main.yml

@@ -35,6 +35,8 @@ jobs:
           enable-cache: true
       - name: Install just
         uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
+        with:
+          just-version: "1.43.1"
       - name: Run type checking
         run: just typing
 
@@ -61,6 +63,8 @@ jobs:
           enable-cache: true
       - name: Install just
         uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
+        with:
+          just-version: "1.43.1"
       - name: Run tests
         run: just test