Bump poetry version

Author: acmiyaguchi

.github/workflows/pull-docs.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         python-version: [ "3.11" ]
-        poetry-version: [ "1.8.3" ]
+        poetry-version: [ "2.2.1" ]
     steps:
       # ======
       # Checkout, set up python

.github/workflows/push-test.yml

@@ -9,8 +9,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9"]
-        poetry-version: ["1.2.1"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        poetry-version: [ "2.2.1" ]
 
     steps:
       # ======
@@ -65,8 +65,8 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python-version: ["3.9"]
-        poetry-version: ["1.2.1"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        poetry-version: [ "2.2.1" ]
     steps:
       # ======
       # Checkout, set up python

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.9"]
-        poetry-version: ["1.2.1"]
+        poetry-version: [ "2.2.1" ]
     steps:
       # ======
       # Checkout, set up python