Removed invalid reference to matrix build (#54)

* Removed invalid matrix reference from GH workflow pypi_release.yaml
* Set python version and fixed typo in workflow file

Author: ckunki

.github/workflows/pypi_release.yaml

@@ -9,7 +9,7 @@ on:
 jobs:
 
   cd-job:
-    name: Continues Delivery
+    name: Continuous Delivery
     runs-on: ubuntu-latest
     steps:
 
@@ -19,7 +19,7 @@ jobs:
       - name: Setup Python & Poetry Environment
         uses: exasol/python-toolbox/.github/actions/python-environment@0.13.0
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: "3.10"
 
       - name: Build Artifacts
         run: poetry build