Pin rust toolchain version

This ensures that a specific (`1.76`) rust version is used. More recent versions break the `time` version currently used: ``` <failure> = note: this is an inference error on crate `time` caused by an API change in Rust 1.80.0; update `time` to version `>=0.3.35` by calling `cargo update` ```
dfinity · Dec 3, 2024 · 1fc3d55 · 1fc3d55
1 parent 588e362
commit 1fc3d55
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/search/rust-toolchain.toml b/search/rust-toolchain.toml
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+[toolchain]
+channel = "1.76.0"