Codecov Action fails with GPG signature error

[manishdait]

The CI pipeline fails during the Upload coverage to Codecov step when using codecov/codecov-action with cannot verify the GPG signature message.
https://github.com/hiero-ledger/hiero-sdk-python/actions/runs/27093532142/job/79990147770?pr=2338#step:10:300

==> Verifying GPG signature integrity
 -> Downloading https://cli.codecov.io/latest/linux/codecov.SHA256SUM
 -> Downloading https://cli.codecov.io/latest/linux/codecov.SHA256SUM.sig
 
gpg: Signature made Tue Apr 21 19:28:03 2026 UTC
gpg:                using RSA key 27034E7FDB850E0BBC2C62FF806BB28AED779869
gpg: Can't check signature: No public key
==> Could not verify signature. Please contact Codecov if problem continues
    Exiting...

[github-actions]

Thanks for your submission.

This issue is awaiting approval from @hiero-ledger/hiero-sdk-python-triage and @hiero-ledger/hiero-sdk-python-committers and @hiero-ledger/hiero-sdk-python-maintainers.

[github-actions]

Approved by @hiero-ledger/hiero-sdk-python-triage and @hiero-ledger/hiero-sdk-python-committers and @hiero-ledger/hiero-sdk-python-maintainers.