fix: Quote python_version wildcard

[matthewfeickert]

• If an unquoted wildcard is used for python_version the rattler-build recipe will fail.
• Amends PR docs: add pure python example recipe #2739

Example:

$ git clone git@github.com:conda-forge/contur-feedstock.git && contur-feedstock
$ git diff
diff --git a/recipe/recipe.yaml b/recipe/recipe.yaml
index 5cc7585..ec228f7 100644
--- a/recipe/recipe.yaml
+++ b/recipe/recipe.yaml
@@ -93,7 +93,7 @@ tests:
       pip_check: true
       python_version:
         - ${{ python_min }}.*
-        - "*"
+        - *
   - script:
       - contur --version
       - contur --help
$ pixi run build-locally
...
Error:   × Failed to parse recipe
  ╰─▶ parse error: Failed to parse YAML: 96:11: while scanning an anchor or alias, did not find expected alphabetic or numeric character
   ╭─[/home/conda/recipe_root/recipe.yaml:1:1]
 1 │ schema_version: 1
   · ▲
   · ╰── Failed to parse YAML: 96:11: while scanning an anchor or alias, did not find expected alphabetic or numeric character
 2 │ 
   ╰────

Traceback (most recent call last):
  File "/home/feickert/Code/GitHub/conda-forge/hep-packaging-coordination/contur-feedstock/./build-locally.py", line 125, in <module>
    main()
  File "/home/feickert/Code/GitHub/conda-forge/hep-packaging-coordination/contur-feedstock/./build-locally.py", line 113, in main
    run_docker_build(ns)
  File "/home/feickert/Code/GitHub/conda-forge/hep-packaging-coordination/contur-feedstock/./build-locally.py", line 34, in run_docker_build
    subprocess.check_call([script])
  File "/home/feickert/Code/GitHub/conda-forge/hep-packaging-coordination/contur-feedstock/.pixi/envs/smithy/lib/python3.10/subprocess.py", line 369, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['.scripts/run_docker_build.sh']' returned non-zero exit status 1.

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[matthewfeickert]

This was caught already by @isuruf in #2739 (comment) but somehow this didn't make it into the merged state of PR #2739 as git blame shows that the original file has no quotes.

https://github.com/conda-forge/conda-forge.github.io/blame/c52ebdb725094fd18264c846d15b57b4a92d9cf9/docs/maintainer/example_recipes/pure-python.md#L173