update MSRV (#6896)

Author: jxs

lighthouse/Cargo.toml

@@ -4,7 +4,7 @@ version = "6.0.1"
 authors = ["Sigma Prime <[email protected]>"]
 edition = { workspace = true }
 autotests = false
-rust-version = "1.82.0"
+rust-version = "1.83.0"
 
 [features]
 default = ["slasher-lmdb", "beacon-node-leveldb"]