Consolidate dependency update workflows

Removed separate workflows for updating bids-matlab, dicm2nii, and export_fig, and replaced them with a single workflow to update all dependencies together. This simplifies maintenance and centralizes dependency updates into one scheduled GitHub Action.

Author: markmikkelsen

.github/workflows/update_bids-matlab.yml

@@ -0,0 +1,54 @@
+name: Update dependencies - bids-matlab, dic2nii, etc.
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+run-name: ${{ github.actor }} is updating dependencies
+
+on:
+  schedule:
+  - cron: 0 0 * * 1 # Every monday
+  workflow_dispatch:
+
+jobs:
+  update-dependencies:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout gannet repo
+        uses: actions/checkout@v5
+
+      - name: Checkout bids-matlab repo
+        uses: actions/checkout@v5
+        with:
+          repository: bids-standard/bids-matlab
+          path: bids-matlab_tmp/
+
+      - name: Checkout dicm2nii repo
+        uses: actions/checkout@v5
+        with:
+          repository: xiangruili/dicm2nii
+          path: dicm2nii_tmp/
+
+      - name: Checkout export_fig repo
+        uses: actions/checkout@v5
+        with:
+          repository: altmany/export_fig
+          path: export_fig_tmp/
+
+      - name: Copy files from separate repos to current repo
+        run: |
+          rsync -av --exclude '.git' bids-matlab_tmp/ bids-matlab/
+          rsync -av --exclude '.git' dicm2nii_tmp/ dicm2nii/
+          rsync -av --exclude '.git' --exclude '.ignore' export_fig_tmp/ export_fig/
+          rm -rf bids-matlab_tmp/ dicm2nii_tmp/ export_fig_tmp/
+
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: Sync with dependencies repos
+          assignees: markmikkelsen
+          base: main
+          delete-branch: true
+          title: '[BOT] Update dependencies - bids-matlab, dic2nii, etc.'
+          body: Done by a [GitHub Action](https://github.com/markmikkelsen/Gannet/blob/main/.github/workflows/update_dependencies.yml)