crypto/tls: BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256 failures

[gopherbot]

#!watchflakes
default <- pkg == "crypto/tls" && test ~ `BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256`

Issue created automatically to collect these failures.

Example (log):

=== RUN   BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256
BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256
--- FAIL: BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "crypto/tls" && test == "BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256"

2024-06-18 16:32 gotip-darwin-amd64-race go@4cf2b025 crypto/tls.BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256 (log)

=== RUN   BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256
BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256
--- FAIL: BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256

2024-06-18 19:33 gotip-darwin-amd64-race go@879ace14 crypto/tls.BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256 (log)

=== RUN   BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256
BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256
--- FAIL: BenchmarkHandshakeServer/ECDHE-X25519-ECDSA-P256

— watchflakes

[cherrymui]

Dup of #68418