Update codecov to 5.1.2.

Author: io7m

.github/workflows/main.linux.temurin.lts.yml

@@ -47,7 +47,7 @@ jobs:
           path: ./com.io7m.jattribute.tests/target/surefire-reports
 
       - name: Coverage
-        uses: codecov/[email protected].1
+        uses: codecov/[email protected].2
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: com.io7m.jattribute.tests/target/site/jacoco-aggregate/jacoco.xml