ccl/sqlproxyccl: TestFailedConnection failed

ccl/sqlproxyccl.TestFailedConnection [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Ci_TestsAwsLinuxArm64_UnitTests/17855988?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Ci_TestsAwsLinuxArm64_UnitTests/17855988?buildTab=artifacts#/) on master @ [354444d779926ae8fe73afc19acbfa3204ac6c9f](https://github.com/cockroachdb/cockroach/commits/354444d779926ae8fe73afc19acbfa3204ac6c9f):

```
=== RUN TestFailedConnection
test_log_scope.go:165: test logs captured to: /artifacts/tmp/_tmp/591e497c85919969802065d6359503c1/logTestFailedConnection30391734
test_log_scope.go:76: use -show-logs to present logs inline
proxy_handler_test.go:2952:
Error Trace: pkg/ccl/sqlproxyccl/proxy_handler_test.go:2986
Error: Expect "failed to connect to ``host=localhost user=unused database=``: failed to receive message (unexpected EOF)" to match "server requires encryption"
Test: TestFailedConnection
panic.go:626: -- test log scope end --
test logs left over in: /artifacts/tmp/_tmp/591e497c85919969802065d6359503c1/logTestFailedConnection30391734
--- FAIL: TestFailedConnection (1.04s)
```
Help

See also: [How To Investigate a Go Test Failure \(internal\)](https://cockroachlabs.atlassian.net/l/c/HgfXfJgM)

/cc @cockroachdb/sql-foundations @cockroachdb/server

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Jira issue: CRDB-44737