Move to Rust 1.83 (#211)

This PR updates the pinned Rust version to 1.83, and updates mmtk-core
to mmtk/mmtk-core#1253.

.github/mergify.yml

@@ -0,0 +1,34 @@
+pull_request_rules:
+  - name: backport patches to v1.8.2+RAI
+    conditions:
+      - base=master
+      - label=backport-v1.8.2+RAI
+    actions:
+      backport:
+        branches:
+          - v1.8.2+RAI
+        assignees:
+          - "{{ author }}"
+        label_conflicts: backport-conflicts
+  - name: backport patches to v1.9.2+RAI
+    conditions:
+      - base=master
+      - label=backport-v1.9.2+RAI
+    actions:
+      backport:
+        branches:
+          - v1.9.2+RAI
+        assignees:
+          - "{{ author }}"
+        label_conflicts: backport-conflicts
+  - name: backport patches to dev
+    conditions:
+      - base=master
+      - label=backport-dev
+    actions:
+      backport:
+        branches:
+          - dev
+        assignees:
+          - "{{ author }}"
+        label_conflicts: backport-conflicts

mmtk/Cargo.toml

@@ -27,7 +27,7 @@ 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 = "c0f97884234b51b13c8ba5d1563a8e0f592d11c2" }
+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/rust-toolchain

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