Update checkout action version for create_certs and add_identifiers

Copied from LoopKit

.github/workflows/add_identifiers.yml

@@ -12,7 +12,7 @@ jobs:
       
       # Checks-out the repo
       - name: Checkout Repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         
       # Patch Fastlane Match to not print tables
       - name: Patch Match Tables

.github/workflows/create_certs.yml

@@ -12,7 +12,7 @@ jobs:
       
       # Checks-out the repo
       - name: Checkout Repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         
       # Patch Fastlane Match to not print tables
       - name: Patch Match Tables