fix: update Codecov action file input

Change the input parameter `file` to `files` in the
Codecov action step. Codecov's action now expects
the parameter to be named `files` instead of `file`.
This change ensures that coverage reports are
uploaded correctly, preventing potential errors or
misconfigurations in the CI workflow.

Author: DefinitelyADev

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
       if: matrix.python-version == '3.11'
       uses: codecov/codecov-action@v5
       with:
-        file: ./coverage.xml
+        files: ./coverage.xml
         fail_ci_if_error: false
 
   validate:

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Updated CI workflow tag patterns to restrict triggers to version tags matching `vX.X.X` or `vX.X.X-<short-commit-hash>`
+- Fixed Codecov action input to use 'files' instead of 'file'
 - Fixed workflow permissions to resolve code scanning alerts
 
 ## [1.2.0] - 2025-09-22