crypto/ecdsa: TestSignAndVerify failures

[gopherbot]

#!watchflakes
default <- pkg == "crypto/ecdsa" && test == "TestSignAndVerify"

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestSignAndVerify (0.00s)
    --- FAIL: TestSignAndVerify/P256 (0.00s)
        ecdsa_test.go:87: Verify failed

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "crypto/ecdsa" && test == "TestSignAndVerify"

2024-03-29 23:09 linux-ppc64le-power10osu go@89f7805c crypto/ecdsa.TestSignAndVerify (log)

--- FAIL: TestSignAndVerify (0.00s)
    --- FAIL: TestSignAndVerify/P256 (0.00s)
        ecdsa_test.go:87: Verify failed

2024-03-29 23:09 linux-ppc64le-power9osu go@89f7805c crypto/ecdsa.TestSignAndVerify (log)

--- FAIL: TestSignAndVerify (0.00s)
    --- FAIL: TestSignAndVerify/P256 (0.00s)
        ecdsa_test.go:87: Verify failed

— watchflakes