Raise required compiler to Rust 1.71

For std::hash::BuildHasher::hash_one.
https://doc.rust-lang.org/std/hash/trait.BuildHasher.html#method.hash_one

Author: dtolnay

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         toolchain:
-          - "1.65"
+          - "1.71"
           - stable
     runs-on: ubuntu-latest
     steps:

Cargo.toml

@@ -3,7 +3,7 @@ name = "imara-diff"
 version = "0.1.7"
 edition = "2021"
 authors = ["pascalkuthe <[email protected]>"]
-rust-version = "1.61"
+rust-version = "1.71"
 license = "Apache-2.0"
 
 description = "A high performance library for computing diffs."