README: bump pins (#163)

Author: woodruffw

README.md

@@ -90,7 +90,7 @@ jobs:
           persist-credentials: false
 
       - name: Run zizmor 🌈
-        uses: zizmorcore/zizmor-action@3dc1ecc9bcb9e94e9b2c709687979e1298497054 # v0.6.2
+        uses: zizmorcore/zizmor-action@70fb788f84895a7701f5643d103d587e460b5c99 # v0.6.3
 ```
 
 ### Usage without Github Advanced Security
@@ -125,7 +125,7 @@ jobs:
           persist-credentials: false
 
       - name: Run zizmor 🌈
-        uses: zizmorcore/zizmor-action@3dc1ecc9bcb9e94e9b2c709687979e1298497054 # v0.6.2
+        uses: zizmorcore/zizmor-action@70fb788f84895a7701f5643d103d587e460b5c99 # v0.6.3
         with:
           advanced-security: false
 ```
@@ -145,7 +145,7 @@ repositories:
 
 ```yaml
 - name: Run zizmor 🌈
-  uses: zizmorcore/zizmor-action@3dc1ecc9bcb9e94e9b2c709687979e1298497054 # v0.6.2
+  uses: zizmorcore/zizmor-action@70fb788f84895a7701f5643d103d587e460b5c99 # v0.6.3
   with:
     inputs: |
       .github/workflows/fishy.yml