Update sled-agent-client digest to d6612c5

Author: renovate[bot]

Cargo.toml

@@ -45,7 +45,7 @@ serde_with = { version = "3.15.1", default-features = false }
 serialport = { git = "https://github.com/jgallagher/serialport-rs", branch = "illumos-support" }
 sha2 = "0.10.9"
 sha3 = { version = "0.10.8", default-features = false }
-sled-agent-client = { git = "https://github.com/oxidecomputer/omicron", rev = "becbbb616f5f18b59cc42e511c148734c2ba3831" }
+sled-agent-client = { git = "https://github.com/oxidecomputer/omicron", rev = "d6612c5f300e96f4932dc09ff03e7e41ff773237" }
 sled-agent-types-versions = { git = "https://github.com/oxidecomputer/omicron", rev = "becbbb616f5f18b59cc42e511c148734c2ba3831" }
 slog = { version = "2.8.2", default-features = false }
 slog-async = "2.8.0"