Re-enable zig example on CI (#2030)

Author: illicitonion

.bazelci/presubmit.yml

@@ -580,13 +580,12 @@ tasks:
       - "--apple_platform_type=ios"
     test_targets:
       - "//..."
-  # TODO: https://github.com/bazelbuild/rules_rust/issues/1892
-  # zig_cross_compiling:
-  #   name: Zig cross compiling test
-  #   platform: ubuntu2004
-  #   working_directory: examples/zig_cross_compiling
-  #   build_targets:
-  #     - "//..."
+  zig_cross_compiling:
+    name: Zig cross compiling test
+    platform: ubuntu2004
+    working_directory: examples/zig_cross_compiling
+    build_targets:
+      - "//..."
 
 buildifier:
   version: latest

examples/zig_cross_compiling/WORKSPACE.bazel

@@ -30,7 +30,7 @@ load("@rules_rust//crate_universe:repositories.bzl", "crate_universe_dependencie
 
 crate_universe_dependencies(bootstrap = True)
 
-rust_version = "1.65.0"
+rust_version = "1.70.0"
 
 rust_register_toolchains(
     edition = "2021",