chore: Bump MSRV to 1.83.0

Author: kakoc

contract-tests/Cargo.toml

@@ -2,7 +2,7 @@
 name = "contract-tests"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.82.0"  # MSRV
+rust-version = "1.83.0"  # MSRV
 license = "Apache-2.0"
 
 [dependencies]

launchdarkly-server-sdk/Cargo.toml

@@ -4,7 +4,7 @@ description = "LaunchDarkly Server-Side SDK"
 version = "2.6.1"
 authors = ["LaunchDarkly"]
 edition = "2021"
-rust-version = "1.82.0"  # MSRV
+rust-version = "1.83.0"  # MSRV
 license = "Apache-2.0"
 homepage = "https://docs.launchdarkly.com/sdk/server-side/rust"
 repository = "https://github.com/launchdarkly/rust-server-sdk"