📌 Update minimum Python version to 3.9 (#786)

- Update minimum Python version to `3.9`

ToDo:
- [x] Fix all errors
- [x] Update docker containers
- [x] Use `functools.cachedtools`  
- [x] Test docker containers

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: mostafajahanifar <74412979+mostafajahanifar@users.noreply.github.com>

.github/workflows/docker-publish.yml

@@ -15,8 +15,6 @@ jobs:
       fail-fast: true
       matrix:
         include:
-          - dockerfile: ./docker/3.8/Debian/Dockerfile
-            mtag: py3.8-debian
           - dockerfile: ./docker/3.9/Debian/Dockerfile
             mtag: py3.9-debian
           - dockerfile: ./docker/3.9/Ubuntu/Dockerfile
@@ -25,7 +23,15 @@ jobs:
             mtag: py3.10-debian
           - dockerfile: ./docker/3.10/Ubuntu/Dockerfile
             mtag: py3.10-ubuntu
-          - dockerfile: ./docker/3.10/Ubuntu/Dockerfile
+          - dockerfile: ./docker/3.11/Debian/Dockerfile
+            mtag: py3.11-debian
+          - dockerfile: ./docker/3.11/Ubuntu/Dockerfile
+            mtag: py3.11-ubuntu
+          - dockerfile: ./docker/3.12/Debian/Dockerfile
+            mtag: py3.12-debian
+          - dockerfile: ./docker/3.12/Ubuntu/Dockerfile
+            mtag: py3.12-ubuntu
+          - dockerfile: ./docker/3.12/Ubuntu/Dockerfile
             mtag: latest
     permissions:
       contents: read

.github/workflows/mypy-type-check.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
 

.github/workflows/pip-install.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
         os: [ubuntu-22.04, windows-latest, macos-latest]
     steps:
     - name: Set up Python ${{ matrix.python-version }}

.github/workflows/python-package.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v3

README.md

@@ -115,7 +115,7 @@ Prepare a computer as a convenient platform for further development of the Pytho
 5. Create virtual environment for TIAToolbox using
 
 ```sh
-    $ conda create -n tiatoolbox-dev python=3.8 # select version of your choice
+    $ conda create -n tiatoolbox-dev python=3.9 # select version of your choice
     $ conda activate tiatoolbox-dev
     $ pip install -r requirements/requirements_dev.txt
 ```