[ci] Bump codecov version, fix gpg failure.

Author: dlyr

.github/workflows/build-matrix.yml

@@ -278,7 +278,7 @@ jobs:
 
       - name: Upload unittests coverage report
         if: ${{ inputs.coverage == 'true' }}
-        uses: codecov/codecov-action@v6.0.0
+        uses: codecov/codecov-action@v7
         with:
           fail_ci_if_error: true # optional (default = false)
           files: ${{ steps.paths.outputs.radium_build_dir }}/fastcov_unittests.info
@@ -289,7 +289,7 @@ jobs:
 
       - name: Upload integration coverage report
         if: ${{ inputs.coverage == 'true' }}
-        uses: codecov/codecov-action@v6.0.0
+        uses: codecov/codecov-action@v7
         with:
           fail_ci_if_error: true # optional (default = false)
           files: ${{ steps.paths.outputs.radium_build_dir }}/fastcov_integration.info