Move to Rust 1.83 (backport #211) (#214)

This PR updates the pinned Rust version to 1.83, and updates mmtk-core
to https://github.com/mmtk/mmtk-core/pull/1253.<hr>This is an automatic
backport of pull request #211 done by [Mergify](https://mergify.com).

---------

Co-authored-by: Yi Lin <qinsoon@gmail.com>

Author: mergify[bot]

mmtk/Cargo.lock

@@ -33,7 +33,7 @@ lazy_static = "1.1"
 # - change branch
 # - change repo name
 # But other changes including adding/removing whitespaces in commented lines may break the CI
-mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "2e548e5912ec195cce8d12811902a8617c4143e2" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "ec745353a8de72b645613e0fef3ab7f5f1ad9bd1" }
 # Uncomment the following to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 log = {version = "0.4", features = ["max_level_trace", "release_max_level_off"] }

mmtk/Cargo.toml

@@ -1 +1 @@
-1.77.0
+1.83.0