Refactoring/338 update to ptb 8.1.1 (#339)

* Update exasol-toolbox to 8.1.1, increase range on exasol-integration-test-docker-environment
* Update workflows to 8.1.1
* Manually updated PTB action to v8

Author: ArBridgeman

.github/workflows/build-and-publish.yml

@@ -27,7 +27,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Set up Python & Poetry Environment
-        uses: exasol/python-toolbox/.github/actions/python-environment@v6
+        uses: exasol/python-toolbox/.github/actions/python-environment@v8
         with:
           python-version: ${{ matrix.python-version }}
           poetry-version: "2.3.0"