Fix CI file

Author: cparata

.github/workflows/Continuous-Integration.yml

@@ -21,7 +21,7 @@ jobs:
     steps:
     # First of all, clone the repo using the checkout action.
     - name: Checkout
-      uses: actions/checkout@master
+      uses: actions/checkout@main
 
     - name: Astyle check
       id: Astyle
@@ -54,11 +54,11 @@ jobs:
     steps:
     # First of all, clone the repo using the checkout action.
     - name: Checkout
-      uses: actions/checkout@master
+      uses: actions/checkout@main
 
     - name: Compilation
       id: Compile
-      uses: stm32duino/actions/compile-examples@master
+      uses: stm32duino/actions/compile-examples@main
       with:
         board-pattern: "NUCLEO_L476RG"
         libraries: "STM32duino NFC-RFAL, STM32duino ST25R3916"