Remove deprecation warnings in pixi.toml (#94)

Author: pavelzw

template/pixi.toml.jinja

@@ -1,4 +1,4 @@
-[project]
+[workspace]
 name = "{{ project_slug }}"
 channels = ["conda-forge"]
 platforms = ["osx-arm64", "osx-64", "linux-64", "win-64"]
@@ -8,8 +8,6 @@ postinstall = "pip install --no-build-isolation --no-deps --disable-pip-version-
 
 [dependencies]
 python = ">={{ minimal_python_version.replace('py3', '3.') }}"
-
-[host-dependencies]
 pip = "*"
 setuptools = ">=61"
 setuptools-scm = "*"