github: Disable python 3.7

Python 3.7 has been dropped as testing moved to ubuntu 24.04.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v4