Fix codecov "file"->"files" parameter

Author: cowtowncoder

.github/workflows/main.yml

@@ -76,7 +76,7 @@ jobs:
       uses: codecov/codecov-action@1e68e06f1dbfde0e4cefc87efeba9e4643565303 # v5.1.2
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
-        file: ./target/site/jacoco/jacoco.xml
+        files: ./target/site/jacoco/jacoco.xml
         flags: unittests
 
   trigger-dep-builds-v2: