fix: move direct dependency on differint

Makefile

@@ -83,8 +83,10 @@ pin: $(REQUIREMENTS)	## Pin dependencies versions to requirements.txt
 .PHONY: pin
 
 pip-install:			## Install pinned dependencies from requirements.txt
-	$(PYTHON) -m pip install --upgrade pip hatchling wheel
-	$(PYTHON) -m pip install -r requirements-dev.txt -e .
+	$(PYTHON) -m pip install --upgrade editables hatchling pip wheel
+	$(PYTHON) -m pip install -r requirements-git.txt
+	$(PYTHON) -m pip install -r requirements-dev.txt
+	$(PYTHON) -m pip install --verbose --editable .
 .PHONY: pip-install
 
 test:					## Run pytest tests

docs/changelog.rst

@@ -9,7 +9,7 @@ Dependencies
 
 * Bumped minimum Python version to 3.10. This is a hard requirement, as it
   comes with some changes to the typing syntax and other functions
-  (e.g. we make use of `zip(..., strict=True)`).
+  (e.g. we make use of ``zip(..., strict=True)``).
 
 Features
 ^^^^^^^^

pyproject.toml

@@ -44,7 +44,6 @@ dependencies = [
     "scipy>=1.7",
 ]
 optional-dependencies.dev = [
-    "differint @ git+https://github.com/differint/differint.git#egg=differint",
     "doc8",
     "matplotlib",
     "mypy",

requirements-dev.txt

@@ -34,8 +34,6 @@ contourpy==1.3.0
     # via matplotlib
 cycler==0.12.1
     # via matplotlib
-differint @ git+https://github.com/differint/differint.git@0c4b6ebe8c0d97fc3b3b95c65dbb0323e3a23591#egg=differint
-    # via pycaputo (pyproject.toml)
 doc8==1.1.1
     # via pycaputo (pyproject.toml)
 docutils==0.20.1
@@ -78,7 +76,6 @@ numpy==2.1.0
     # via
     #   pycaputo (pyproject.toml)
     #   contourpy
-    #   differint
     #   matplotlib
     #   scipy
 packaging==24.1

requirements-git.txt

@@ -0,0 +1,3 @@
+# NOTE: Put git dependencies here that cannot be in `pyproject.toml` (PyPI does
+# not allow including direct dependencies like this)
+git+https://github.com/differint/differint.git#egg=differint