CI: Upgrade codecov-action

[dveeden]

What problem does this PR solve?

What is changed and how does it work?

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

NONE

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[wuhuizuo]

/cc @csuzhangxc @liubog2008

[wuhuizuo]

The ci job is so weak. 😭

--- FAIL: TestPDPodSyncForLeaderTransfer (241.14s)
    --- FAIL: TestPDPodSyncForLeaderTransfer/transfer_leader_only (60.01s)
        pod_control_test.go:636: 
            Timed out after 60.001s.
            Expected success, but got an error:
                <*errors.StatusError | 0xc00001b2c0>: 
                tidbcluster.pingcap.com "test-pd" not found
                {
                    ErrStatus: {
                        TypeMeta: {Kind: "", APIVersion: ""},
                        ListMeta: {
                            SelfLink: "",
                            ResourceVersion: "",
                            Continue: "",
                            RemainingItemCount: nil,
                        },
                        Status: "Failure",
                        Message: "tidbcluster.pingcap.com \"test-pd\" not found",
                        Reason: "NotFound",
                        Details: {Name: "test-pd", Group: "pingcap.com", Kind: "tidbcluster", UID: "", Causes: nil, RetryAfterSeconds: 0},
                        Code: 404,
                    },
                }

[dveeden]

It didn't run the "Upload test coverage" in pull (test), possibly due to the TestPDPodSyncForLeaderTransfer failure. That means it didn't really try the changes in this PR yet.