fix: update tooling

Author: ViRb3

.github/workflows/sign.yml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   sign:
-    runs-on: macos-12
+    runs-on: macos-13
     timeout-minutes: 30
     env:
       SECRET_URL: "${{ secrets.SECRET_URL }}"

.semaphore/semaphore.yml

@@ -14,7 +14,7 @@ blocks:
         - name: Sign
           commands:
             - checkout
-            - nvm install 18
+            - nvm install 20
             - cache restore session
             - PYTHONUNBUFFERED=1 ./sign.py
             - cache delete session