Revert "Avoid pyparsing 3.1.3 with Python 3.6. (#57)"

This reverts commit 760186d.

.github/workflows/nox.yml

@@ -98,10 +98,6 @@ jobs:
       - name: Setup nox - downgrade virtualenv
         run: |
           pipx inject --force nox 'virtualenv<20.22.0'
-      - name: Adjust pyproject.yoml
-        run: |
-          sed -i -e 's/requires = \["hatchling"\]/requires = ["hatchling", "pyparsing < 3.1.3"]/' pyproject.toml
-          cat pyproject.toml
       - name: Set up nox environments
         run: |
           nox -v -e test -p 3.6 --install-only

noxfile.py

@@ -35,8 +35,6 @@ def install(session: nox.Session, *args, editable=False, **kwargs):
 
 @nox.session(python=["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"])
 def test(session: nox.Session):
-    if session.python in ("3.6",):
-        install(session, "pyparsing < 3.1.3")
     install(session, ".[test, coverage]", editable=True)
     covfile = Path(session.create_tmp(), ".coverage")
     more_args = []