use latest SHA instead of tag for tj action (#2182)

* use latest SHA instead of tag for tj action
The latest version is v46.0.1, released yesterday (16 March 2025). See URL.

The author suggested increasing the tag, as it is mutable, but the SHA is not.

Therefore, we are switching to SHA to avoid unexpected updates in the future.

* Update .github/workflows/flake8_linter_python_files.yml

Co-authored-by: Wayne Greeff <[email protected]>

---------

Co-authored-by: Wayne Greeff <[email protected]>

Author: Tian-2017

.github/workflows/flake8_linter_python_files.yml

@@ -23,7 +23,7 @@ jobs:
 
       - name: Get Changed Files
         id: changed-files
-        uses: tj-actions/changed-files@v44
+        uses: tj-actions/changed-files@2f7c5bfce28377bc069a65ba478de0a74aa0ca32 # v46.0.1
         with:
           files: |
             **.py