make conda recipe data-loading stricter (#90)

Contributes to rapidsai/build-planning#72.

Proposes replacing a use of `.get()` in the conda recipe with `[]`, to
ensure that we get a loud build error if the `"project"` table is not
present when `conda-build` reads `pyproject.toml`.

## Notes for Reviewers

I know that at some time in the past, the `.get()` was introduced as a
possible solution for errors observed at build time:
#33 (comment)

Pushed this to see if those issues are still present, and they don't
seem to be!

conda/recipes/pynvjitlink/meta.yaml

@@ -5,7 +5,7 @@
     load_file="pynvjitlink/VERSION",
     regex_pattern="(?P<value>.*)"
 )[0] %}
-{% set project_data = data.get("project") %}
+{% set project_data = data["project"] %}
 {% set project_urls = project_data["urls"] %}
 
 package: