Get rid of copies of the Zig version

.github/actions/install/action.yml

@@ -2,10 +2,6 @@ name: "Browsercore install"
 description: "Install deps for the project browsercore"
 
 inputs:
-  zig:
-    description: 'Zig version to install'
-    required: false
-    default: '0.15.2'
   arch:
     description: 'CPU arch used to select the v8 lib'
     required: false
@@ -38,9 +34,8 @@ runs:
         sudo apt-get update
         sudo apt-get install -y wget xz-utils python3 ca-certificates git pkg-config libglib2.0-dev gperf libexpat1-dev cmake clang
 
+    # Zig version used from the `minimum_zig_version` field in build.zig.zon
     - uses: mlugg/setup-zig@v2
-      with:
-        version: ${{ inputs.zig }}
 
     - name: Cache v8
       id: cache-v8

.github/workflows/build.yml

@@ -26,10 +26,9 @@ jobs:
     timeout-minutes: 15
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-          # fetch submodules recusively, to get zig-js-runtime submodules also.
           submodules: recursive
 
       - uses: ./.github/actions/install

.github/workflows/e2e-test.yml

@@ -49,10 +49,9 @@ jobs:
     if: github.event.pull_request.draft == false
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-          # fetch submodules recusively, to get zig-js-runtime submodules also.
           submodules: recursive
 
       - uses: ./.github/actions/install

.github/workflows/wpt.yml

@@ -22,10 +22,9 @@ jobs:
     timeout-minutes: 90
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-          # fetch submodules recusively, to get zig-js-runtime submodules also.
           submodules: recursive
 
       - uses: ./.github/actions/install

.github/workflows/zig-fmt.yml

@@ -1,8 +1,5 @@
 name: zig-fmt
 
-env:
-  ZIG_VERSION: 0.15.2
-
 on:
   pull_request:
 
@@ -32,14 +29,13 @@ jobs:
     timeout-minutes: 15
 
     steps:
-      - uses: mlugg/setup-zig@v2
-        with:
-          version: ${{ env.ZIG_VERSION }}
-
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
+      # Zig version used from the `minimum_zig_version` field in build.zig.zon
+      - uses: mlugg/setup-zig@v2
+
       - name: Run zig fmt
         id: fmt
         run: |
@@ -58,6 +54,7 @@ jobs:
           fi
 
           echo "${delimiter}" >> "${GITHUB_OUTPUT}"
+
       - name: Fail the job
         if: steps.fmt.outputs.zig_fmt_errs != ''
         run: exit 1

.github/workflows/zig-test.yml

@@ -47,10 +47,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-          # fetch submodules recusively, to get zig-js-runtime submodules also.
           submodules: recursive
 
       - uses: ./.github/actions/install