fix for ci

.github/workflows/docs.yml

-# SPDX-FileCopyrightText: 2024 Thomas Buck <thomas@xythobuz.de>
+# SPDX-FileCopyrightText: 2024 - 2025 Thomas Buck <thomas@xythobuz.de>
 # SPDX-License-Identifier: CERN-OHL-S-2.0+
 #
 #  ------------------------------------------------------------------------------
-# | Copyright (c) 2024 Thomas Buck <thomas@xythobuz.de>                          |
+# | Copyright (c) 2024 - 2025 Thomas Buck <thomas@xythobuz.de>                   |
 # |                                                                              |
 # | This source describes Open Hardware and is licensed under the CERN-OHL-S v2  |
 # | or any later version.                                                        |
         uses: actions/configure-pages@v2
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: 'docs/book'
 
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v4

src/mem.c

  */
 
 #include <string.h>
+#include <inttypes.h>
 
 #include "pico/flash.h"