Update dependency ubuntu to v26

Author: renovate[bot]

.github/workflows/docker.yml

@@ -15,7 +15,7 @@ on:
 
 jobs:
   push:
-    runs-on: 'ubuntu-24.04'
+    runs-on: 'ubuntu-26.04'
     steps:
       - uses: actions/checkout@v7
 

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        image: [macos-26, ubuntu-24.04, windows-2025]
+        image: [macos-26, ubuntu-26.04, windows-2025]
     env:
       DOTNET_NOLOGO: 1
       DOTNET_CLI_TELEMETRY_OPTOUT: 1