Update to flit 4

.github/workflows/release.yml

@@ -97,7 +97,7 @@ jobs:
       with:
         python-version: '3.10'
     - name: Install flit
-      run: pip install flit~=3.8 flit-core~=3.8
+      run: pip install flit~=4.0
     - name: Build
       run: flit build
     - name: Publish to PyPI
@@ -125,7 +125,7 @@ jobs:
       with:
         python-version: '3.10'
     - name: Install flit
-      run: pip install flit~=3.8 flit-core~=3.8
+      run: pip install flit~=4.0
     - name: Build
       run: flit build
     - name: Publish to TestPyPI

docs/source/howto/plugin_codes.rst

@@ -344,7 +344,7 @@ You have just created an ``aiida_diff_tutorial`` Python *package*!
 
     [build-system]
     # build the package with [flit](https://flit.readthedocs.io)
-    requires = ["flit_core >=3.4,<4"]
+    requires = ["flit_core >=3.4,<5"]
     build-backend = "flit_core.buildapi"
 
     [project]

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
 build-backend = 'flit_core.buildapi'
-requires = ['flit_core >=3.8,<5']
+requires = ['flit_core >=4.0.2,<5']
 
 # The "dev" dependency group is automatically synced by uv
 # and should thus contain all necessary deps for local development.