Update python3 requirements installation

Author: henningkayser

.github/workflows/deploy.yml

@@ -24,8 +24,8 @@ jobs:
     - name: Install Python dependencies
       run: |
         sudo apt-get update -y
-        sudo apt-get install -y python3-pip
-        pip3 install --upgrade --requirement requirements.txt
+        sudo apt-get install -y python3-pipx
+        pipx install --upgrade --requirement requirements.txt
 
     - name: Install doxygen and graphviz
       run: sudo apt-get install -y doxygen graphviz
@@ -60,8 +60,8 @@ jobs:
     - name: Install Python dependencies
       run: |
         sudo apt-get update -y
-        sudo apt-get install -y python3-pip
-        pip3 install --upgrade --requirement requirements.txt
+        sudo apt-get install -y python3-pipx
+        pipx install --upgrade --requirement requirements.txt
 
     - name: Install doxygen and graphviz
       run: sudo apt-get install -y doxygen graphviz