Use latest checkout action (#1206)

Rather than hardcoding a specific (now outdated) version of `checkout`,
we can specify the latest `4.x` as per everywhere else.

.github/workflows/action-updater.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4.1.4
+      - uses: actions/checkout@v4
         with:
           # [Required] Access token with `workflow` scope.
           token: ${{ secrets.ACTION_UPDATER }}

.github/workflows/adoc-html.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4.1.4
+    - uses: actions/checkout@v4
     - uses: actions/[email protected]
       with:
         node-version: 20

.github/workflows/backport-5-0.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
       - name: checkout
-        uses: actions/checkout@v4.1.4
+        uses: actions/checkout@v4
         with:
          fetch-depth: 0
 

.github/workflows/backport-5-1.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
       - name: checkout
-        uses: actions/checkout@v4.1.4
+        uses: actions/checkout@v4
         with:
          fetch-depth: 0
 

.github/workflows/backport-5-2.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
       - name: checkout
-        uses: actions/checkout@v4.1.4
+        uses: actions/checkout@v4
         with:
          fetch-depth: 0
 

.github/workflows/backport-5-3.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
       - name: checkout
-        uses: actions/checkout@v4.1.4
+        uses: actions/checkout@v4
         with:
          fetch-depth: 0
 

.github/workflows/backport-5-4.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
       - name: checkout
-        uses: actions/checkout@v4.1.4
+        uses: actions/checkout@v4
         with:
          fetch-depth: 0
 

.github/workflows/backport.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
       - name: checkout
-        uses: actions/checkout@v4.1.4
+        uses: actions/checkout@v4
         with:
          fetch-depth: 0
 

.github/workflows/forwardport.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
 
       - name: checkout
-        uses: actions/checkout@v4.1.4
+        uses: actions/checkout@v4
         with:
          fetch-depth: 0
 

.github/workflows/to-plain-html.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:              
-      - uses: actions/checkout@v4.1.4
+      - uses: actions/checkout@v4
         with:
           token: ${{ secrets.TO_HTML }}      
       - name: Asciidoc to html

.github/workflows/validate.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4.1.4
+    - uses: actions/checkout@v4
     - uses: actions/[email protected]
       with:
         node-version: 20