Add Dependabot configuration for version updates (#351)

Configured Dependabot for GitHub Actions updates.

.github/dependabot.yml

@@ -0,0 +1,14 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  # Enable version updates for GitHub Actions
+  - package-ecosystem: 'github-actions'
+    # Workflow files stored in the default location of `.github/workflows`
+    # You don't need to specify `/.github/workflows` for `directory`. You can use `directory: "/"`.
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/workflows/build-python-packages.yml

@@ -20,7 +20,7 @@ on:
       PLATFORMS:
         description: 'Platforms for execution in "os" or "os_arch" format (arch is "x64" by default)'
         required: true
-        default: 'ubuntu-22.04,ubuntu-22.04_arm64,ubuntu-24.04,ubuntu-24.04_arm64,macos-13_x64,macos-14_arm64,windows-2019_x64,windows-2019_x86,windows-11_arm64'
+        default: 'ubuntu-22.04,ubuntu-22.04_arm64,ubuntu-24.04,ubuntu-24.04_arm64,macos-13_x64,macos-14_arm64,windows-2022_x64,windows-2022_x86,windows-11_arm64'
   pull_request:
     paths-ignore:
     - 'versions-manifest.json'
@@ -44,7 +44,7 @@ jobs:
       - name: Generate execution matrix
         id: generate-matrix
         run: |
-          [String[]]$configurations = "${{ inputs.platforms || 'ubuntu-22.04,ubuntu-22.04_arm64,ubuntu-24.04,ubuntu-24.04_arm64,macos-13,macos-14_arm64,windows-2019_x64,windows-2019_x86,windows-11_arm64' }}".Split(",").Trim()
+          [String[]]$configurations = "${{ inputs.platforms || 'ubuntu-22.04,ubuntu-22.04_arm64,ubuntu-24.04,ubuntu-24.04_arm64,macos-13,macos-14_arm64,windows-2022_x64,windows-2022_x86,windows-11_arm64' }}".Split(",").Trim()
           [String[]]$buildModes = "${{ inputs.threading_build_modes || 'default' }}".Split(",").Trim()
           $matrix = @()
           

.github/workflows/get-python-versions.yml

@@ -1,7 +1,7 @@
 name: Get Python versions
 on:
   schedule:
-    - cron: '0 3,15 * * *'
+    - cron: '0 0,12 * * *'
   workflow_dispatch:
 
 jobs:
@@ -10,4 +10,4 @@ jobs:
     with:
       tool-name: "Python"
       image-url: "https://avatars.githubusercontent.com/u/1525981?s=200&v=4"
-    secrets: inherit
+    secrets: inherit