Update running-ci doc (#79)

As in the [futureware-tech/simulator-actions@v1](https://github.com/futureware-tech/simulator-action#inputs) documentation, it's better to use loose os version. Having it 15 initially broke my CI

Co-authored-by: Manos Konstantinidis <manosim@users.noreply.github.com>

Author: gabimoncha

docs/advanced/running-ci.md

@@ -64,7 +64,7 @@ jobs:
       - uses: futureware-tech/simulator-action@v1
         with:
           model: 'iPhone 13 Pro'
-          os_version: '=15.0'
+          os_version: '>=15.0'
 
       - name: Run Owl Build
         run: yarn owl:build:ios