upgrade to zig 0.13

Author: krichprollsch

.github/actions/install/action.yml

@@ -5,7 +5,7 @@ inputs:
   zig:
     description: 'Zig version to install'
     required: false
-    default: '0.12.1'
+    default: '0.13.0'
   arch:
     description: 'CPU arch used to select the v8 lib'
     required: false

.github/workflows/zig-fmt.yml

@@ -1,7 +1,7 @@
 name: zig-fmt
 
 env:
-  ZIG_VERSION: 0.12.1
+  ZIG_VERSION: 0.13.0
 
 on:
   pull_request:

README.md

@@ -76,7 +76,7 @@ We do not provide yet binary versions of Lightpanda, you have to compile it from
 
 ### Prerequisites
 
-Lightpanda is written with [Zig](https://ziglang.org/) `0.12.1`. You have to
+Lightpanda is written with [Zig](https://ziglang.org/) `0.13.0`. You have to
 install it with the right version in order to build the project.
 
 Lightpanda also depends on