ci: bump extractions/setup-just from 3 to 4 (#20)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
           enable-cache: true
 
       - name: Install just
-        uses: extractions/setup-just@v3
+        uses: extractions/setup-just@v4
 
       - name: Install dev deps
         run: uv sync --all-groups --all-extras
@@ -68,7 +68,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install just
-        uses: extractions/setup-just@v3
+        uses: extractions/setup-just@v4
 
       - name: Install dev deps
         run: uv sync --all-groups --all-extras