chore: stabilize local build environment

.cargo/config.toml

@@ -0,0 +1,8 @@
+[source.crates-io]
+replace-with = "rsproxy-sparse"
+
+[source.rsproxy-sparse]
+registry = "sparse+https://rsproxy.cn/index/"
+
+[net]
+git-fetch-with-cli = true

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.93.1"
+channel = "stable"
 components = ["clippy"]