Update CircleCI config to use Poetry orb

- Added Poetry orb to CircleCI configuration.
- Replaced manual Poetry installation with orb's install command.

.circleci/config.yml

@@ -1,14 +1,15 @@
 version: 2.1
+
+orbs:
+  python: circleci/[email protected]
+
 jobs:
   build:
-    docker:
-      - image: python:3.8
+    executor: python/default
     steps:
       - checkout
-      - run:
-          name: Install Poetry
-          command: |
-            curl -sSL https://install.python-poetry.org | python3 -
+      - python/install-packages:
+          pkg-manager: poetry
       - run:
           name: Install dependencies
           command: |
@@ -21,6 +22,7 @@ jobs:
           name: Run Pytest
           command: |
             poetry run pytest
+
 workflows:
   version: 2
   build: