github/workflow: bump codecov action version to v4

Signed-off-by: Jakob Hahn <jakob.hahn@hetzner.com>

.github/workflows/test-integration.yml

@@ -27,7 +27,7 @@ jobs:
           if curl -s localhost:9200; \
           then echo '=====> ready'; break; fi; if [ $attempt == 25 ]; then exit 1; fi; echo '=====> waiting...'; done
       - run: make test-integ race=true coverage=true
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           file: tmp/integ.cov
           flags: integration

.github/workflows/test-unit.yml

@@ -22,7 +22,7 @@ jobs:
         if: matrix.os != 'ubuntu-latest'
       - run: make test-unit race=true coverage=true
         if: matrix.os == 'ubuntu-latest'
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           file: tmp/unit.cov
           flags: unit

CHANGELOG.md

@@ -19,6 +19,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Change ParseError function to do type assertion to determine error type ([#512](https://github.com/opensearch-project/opensearch-go/pull/506))
 - Removed unused structs and functions from opensearch ([#517](https://github.com/opensearch-project/opensearch-go/pull/517))
 - Adjust and extent opensearch tests for better coverage ([#517](https://github.com/opensearch-project/opensearch-go/pull/517))
+- Bump codecov action version to v4 ([#517](https://github.com/opensearch-project/opensearch-go/pull/517))
 
 ### Deprecated