chores(test): remove python 3.13 from testing matrix

Author: Reckless-Satoshi

.github/workflows/integration-tests.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       max-parallel: 2
       matrix:
-        python-tag: ['3.12.3-slim-bookworm', '3.13-rc-slim-bookworm']
+        python-tag: ['3.12.3-slim-bookworm']
         lnd-version: ['v0.18.2-beta']
         cln-version: ['v24.08']
         ln-vendor: ['LND', 'CLN']