CI syntax fix

Author: robamu

.github/workflows/ci.yml

@@ -142,8 +142,8 @@ jobs:
           # Silicon Labs
           - { chip: SIM3L1x8_SVD }
           # Nordic chips
-          - { chip: nrf51, options: -f register_mod::s:_mod }
-          - { chip: nrf52, options: -f register_mod::s:_mod }
+          - { chip: nrf51, options: "-f register_mod::s:_mod" }
+          - { chip: nrf52, options: "-f register_mod::s:_mod" }
     steps:
       - uses: actions/checkout@v4