Update codechecker to 6.26.1

New version of Codechecker resolved issues with python and other
problems that we faced. So it's time to update.

Author: artemgavrilov

.github/workflows/codechecker.yml

@@ -20,19 +20,13 @@ jobs:
         with:
           submodules: recursive
 
-      # CodeChecker doesn't support python 3.12 for now: https://github.com/Ericsson/codechecker/issues/4350
-      - name: Downgrade python to 3.11
-        uses: actions/setup-python@v5
-        with:
-          python-version: 3.11
-
       - name: Install dependencies
         run: ci_scripts/ubuntu-deps.sh
 
       - name: Install CodeChecker
         run: |
           ## CodeChecker version should match version installed on server side.
-          pip3 install codechecker==6.21
+          pip3 install codechecker==6.26.1
 
       - name: Configure CodeChecker
         run: |