Update Rust crate diesel to 2.2.7 (#229)

Co-authored-by: oxide-renovate[bot] <146848827+oxide-renovate[bot]@users.noreply.github.com>

Author: oxide-renovate[bot]

Cargo.lock

@@ -15,7 +15,7 @@ bb8 = "0.8.6"
 chrono = "0.4.39"
 cookie = { version = "0.18.1" }
 crc32c = "0.6.8"
-diesel = { version = "2.2.6", features = ["postgres"] }
+diesel = { version = "2.2.7", features = ["postgres"] }
 diesel_migrations = { version = "2.2.0" }
 dropshot = { version = "0.15" }
 google-cloudkms1 = "6.0.0"