tests: avoid broken copier (#555)

* tests: avoid broken copier

Signed-off-by: Henry Schreiner <[email protected]>

* Update README.md

---------

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

README.md

@@ -63,14 +63,15 @@ Currently, the best choice is probably hatch for pure Python projects, and
 scikit-build (such as the scikit-build-core + pybind11 choice) for binary
 projects.
 
-#### To use (modern copier version)
+#### To use (copier version)
 
 Install `copier` and `copier-templates-extensions`. Using [uv][], that's:
 
 ```bash
-uv tool install copier --with copier-templates-extensions
+uv tool install copier!=9.5.0 --with copier-templates-extensions
 ```
 
+(Copier 9.5.0 [has a bug](https://github.com/copier-org/copier/issues/1977))
 Now, run copier to generate your project:
 
 ```bash
@@ -87,7 +88,7 @@ future.
 > Note: Add `--vcs-ref=HEAD` to get the latest version instead of the last
 > tagged version; HEAD always passes tests (and is what cookiecutter uses).
 
-#### To use (classic cookiecutter version)
+#### To use (cookiecutter version)
 
 Install cookiecutter, ideally with `brew install cookiecutter` if you use brew,
 otherwise with `uv tool install cookiecutter` (or prepend `uvx` to the command
@@ -100,14 +101,14 @@ cookiecutter gh:scientific-python/cookie
 If you are using cookiecutter 2.2.3+, you will get nice descriptions for the
 options like copier!
 
-#### To use (classic cruft version)
+#### To use (cruft version)
 
 You can also use [cruft][], which adds the ability update to cookiecutter
 projects. Install with `uv tool install cruft` (or prepend `uvx` to the command
 below, and skip installation). Then run:
 
 ```bash
-cruft create gh:scientific-python/cookie
+cruft create https://github.com/scientific-python/cookie
 ```
 
 #### Post generation

noxfile.py

@@ -324,7 +324,8 @@ def nox_session(session: nox.Session, backend: str, vcs: bool) -> None:
 
 @nox.session()
 def compare_copier(session):
-    session.install("cookiecutter", "copier", "copier-templates-extensions")
+    # Copier 9.5.0 broke `--data`
+    session.install("cookiecutter", "copier!=9.5.0", "copier-templates-extensions")
 
     tmp_dir = session.create_tmp()
     session.cd(tmp_dir)