remove poetry constraints arg

Author: bosd

.github/workflows/tests.yml

@@ -59,7 +59,7 @@ jobs:
 
       - name: Install Poetry
         run: |
-          pipx install --pip-args=--constraint=.github/workflows/constraints.txt poetry
+          pipx install poetry
           poetry --version
 
       - name: Install Nox
@@ -135,7 +135,7 @@ jobs:
 
       - name: Install Poetry
         run: |
-          pipx install --pip-args=--constraint=.github/workflows/constraints.txt poetry
+          pipx install poetry
           poetry --version
 
       - name: Install Nox