docs: update workflow documentation URLs

Author: sebthom

.github/workflows/build.yml

@@ -2,7 +2,7 @@
 # SPDX-FileContributor: Sebastian Thomschke, Vegard IT GmbH
 # SPDX-License-Identifier: Apache-2.0
 #
-# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
+# https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions
 name: Build
 
 on:
@@ -18,16 +18,18 @@ on:
     - '.editorconfig'
     - '.git*'
     - '.github/*.yml'
+    - '.github/workflows/stale.yml'
     - '.semaphore/**/*'
   pull_request:
     paths-ignore:
     - '**/*.md'
     - '.editorconfig'
     - '.git*'
     - '.github/*.yml'
+    - '.github/workflows/stale.yml'
     - '.semaphore/**/*'
   workflow_dispatch:
-    # https://github.blog/changelog/2020-07-06-github-actions-manual-triggers-with-workflow_dispatch/
+    # https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#workflow_dispatch
     inputs:
       debug-with-ssh:
         description: "Start an SSH session for debugging purposes at the end of the build:"
@@ -175,7 +177,6 @@ jobs:
         - ubuntu:22.04
         - ubuntu:20.04
         - ubuntu:18.04
-        - ubuntu:16.04
 
     steps:
     - name: Git checkout

.github/workflows/stale.yml

@@ -1,11 +1,12 @@
-# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
+# https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions
 name: Stale issues
 
 on:
   schedule:
+    # https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
     - cron: '0 15 1,15 * *'
   workflow_dispatch:
-    # https://github.blog/changelog/2020-07-06-github-actions-manual-triggers-with-workflow_dispatch/
+    # https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#workflow_dispatch
 
 permissions:
   issues: write

action.yml

@@ -2,7 +2,7 @@
 # SPDX-FileContributor: Sebastian Thomschke, Vegard IT GmbH
 # SPDX-License-Identifier: Apache-2.0
 #
-# https://docs.github.com/en/actions/creating-actions/creating-a-composite-action
+# https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-composite-action
 name: Configure fast APT mirror
 description: Configures a fast APT mirror in Ubuntu runners, e.g. in case azure.archive.ubuntu.com is slow or unreachable.
 author: Vegard IT GmbH (https://vegardit.com)