Update fdsdk 23.08 references to 25.08

Author: bbhtt

docs/dotnet.rst

@@ -113,7 +113,7 @@ A few placeholders have been used in the steps below, while going through the st
 
 .. code-block:: shell
 
-      python3 flatpak-dotnet-generator.py --dotnet 8 --freedesktop 23.08 nuget-sources.json <app-name>/<project-name>.csproj
+      python3 flatpak-dotnet-generator.py --dotnet 8 --freedesktop 24.08 nuget-sources.json <app-name>/<project-name>.csproj
 
 9. Build and install using Flatpak builder
 

docs/first-build.rst

@@ -29,7 +29,7 @@ Flatpak requires every app to specify a runtime for its basic runtime
 dependencies and a matching SDK which is a superset of the runtime
 containing additional development tools, libraries and headers.
 
-In this tutorial we will use the Freedesktop 23.08 runtime and SDK from
+In this tutorial we will use the Freedesktop 25.08 runtime and SDK from
 the Flathub repository.
 
 2. Add a manifest
@@ -45,7 +45,7 @@ an empty file and save it as ``org.flatpak.Hello.yml``.
 
   id: org.flatpak.Hello
   runtime: org.freedesktop.Platform
-  runtime-version: '23.08'
+  runtime-version: '25.08'
   sdk: org.freedesktop.Sdk
   command: hello
   modules:

docs/hosting-a-repository.rst

@@ -101,7 +101,7 @@ The instructions will use Gitlab.com.
     # Name of flatpak bundle
     BUNDLE: "${APP_ID}.flatpak"
     # Docker image to use
-    DOCKER_IMAGE: "ghcr.io/flathub-infra/flatpak-github-actions:freedesktop-23.08"
+    DOCKER_IMAGE: "ghcr.io/flathub-infra/flatpak-github-actions:freedesktop-25.08"
     SCHEDULE_TASK: default
 
   stages:

docs/module-sources.rst

@@ -537,7 +537,7 @@ source.
 
   app-id: com.foo.app.Plugins.audio
   runtime: com.foo.app
-  sdk: org.freedesktop.Sdk//23.08
+  sdk: org.freedesktop.Sdk//25.08
   build-extension: true
   separate-locales: false
   modules: