⬆️ Bump codecov/codecov-action to v7.0.0

Repins `codecov/codecov-action` from `57e3a13` (v6.0.0)
to `fb8b358` (v7.0.0) in the `notify-codecov` job of `ci-cd.yml`.

v7 is required because Codecov rotated the GPG signing key for
the uploader after the Sentry → Harness sale and unpublished the
previous one (Ref: codecov/codecov-action#1956); the older
uploader versions now crash during self-verification.

Author: webknjaz

.github/workflows/ci-cd.yml

@@ -585,7 +585,7 @@ jobs:
       if: >-
         !cancelled()
       # yamllint disable rule:line-length
-      uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2  # v6.0.0
+      uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f  # v7.0.0
       # yamllint enable rule:line-length
       with:
         fail_ci_if_error: >-