Drop Python 3.8 support

Python 3.8 will reach its end of life in October 2024, and
Python 3.9 will become the minimum version required by the project.

Update the GitHub workflows to run tests for Python 3.9, 3.10, 3.11
and 3.12 for future releases.

Signed-off-by: Jose Javier Merchante <jjmerchante@bitergia.com>

.github/workflows/release.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       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@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - name: Download distribution artifact

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
 
     name: Python ${{ matrix.python-version }}
     steps:

README.md

@@ -10,7 +10,7 @@ The backends currently managed by this package support the next repositories:
 
 ## Requirements
 
- * Python >= 3.8
+ * Python >= 3.9
 
 You will also need some other libraries for running the tool, you can find the
 whole list of dependencies in [pyproject.toml](pyproject.toml) file.