fix: confusing tls connection indicator

[bzp2010]

Currently, the log uses 🔓 to indicate a TLS connection, which is confusing.
Since the lock in this icon is open, it appears inconsistent with the expression of security.

To convey security, using a locked lock icon 🔒 seems more appropriate. One piece of evidence is that the code in

pgdog/pgdog/src/net/tls.rs

Line 127 in 9afa9f6

info!("🔓 TLS disabled");

uses 🔓 to indicate TLS is disabled.

Regarding whether to use 🔓 as an indicator for non-TLS connections, I welcome further input.

[CLAassistant]

All committers have signed the CLA.

[levkk]

Now this is the kind of attention to detail we need on this project. Thank you!

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pgdog/src/backend/server.rs	0.00%	1 Missing ⚠️
pgdog/src/frontend/client/mod.rs	0.00%	1 Missing ⚠️

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