Update dockerfile to 3.10

.github/workflows/ci.yml

@@ -3,9 +3,9 @@ name: Freqtrade CI
 on:
   push:
     branches:
-      - master
       - stable
       - develop
+      - python_10
     tags:
   release:
     types: [published]
@@ -51,7 +51,6 @@ jobs:
 
     - name: Installation - *nix
       run: |
-        sudo apt-get install -y libhdf5-serial-dev
         python -m pip install --upgrade pip
         export LD_LIBRARY_PATH=${HOME}/dependencies/lib:$LD_LIBRARY_PATH
         export TA_LIBRARY_PATH=${HOME}/dependencies/lib
@@ -206,7 +205,7 @@ jobs:
     strategy:
       matrix:
         os: [ windows-latest ]
-        python-version: ["3.7", "3.8"]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
 
     steps:
     - uses: actions/checkout@v2