drop support for python 3.9

Author: pranabdas

.github/workflows/build-tests.yml

@@ -15,7 +15,6 @@ jobs:
       matrix:
         os: ["ubuntu-24.04"]
         python-version:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"

README.md

@@ -6,7 +6,7 @@
 
 For a quick installation:
 
-1. Install dependencies: python 3 (tested on Python `3.9`-`3.13`), `pip`, `curl`, [`virtualenv`](https://virtualenv.pypa.io/en/latest/installation/), git, [git-lfs](https://git-lfs.github.com/).
+1. Install dependencies: python 3 (tested on Python `3.10`-`3.13`), `pip`, `curl`, [`virtualenv`](https://virtualenv.pypa.io/en/latest/installation/), git, [git-lfs](https://git-lfs.github.com/).
 
 2. Clone this repository: