msrv: set to Rust 1.60.0

This sets 'rust-version' to 1.60 and also increases the pinned Rust
version that we test against in CI to 1.60.0.

Rust 1.60.0 was released over a year ago and contains some important
stuff. Notably, it includes namespaced and weak dependency features that
are used in the (soon to be) released aho-corasick 1.0. They will also
be extensively used in regex-automata 0.3, which is coming to a
rust-lang/regex repository near you Real Soon Now.

Author: BurntSushi

.github/workflows/ci.yml

@@ -52,7 +52,7 @@ jobs:
         include:
         - build: pinned
           os: ubuntu-latest
-          rust: 1.41.1
+          rust: 1.60.0
         - build: stable
           os: ubuntu-latest
           rust: stable

Cargo.toml

@@ -15,6 +15,7 @@ categories = ["text-processing"]
 autotests = false
 exclude = ["/scripts/*", "/.github/*"]
 edition = "2018"
+rust-version = "1.60.0"
 
 [workspace]
 members = [

regex-syntax/Cargo.toml

@@ -9,6 +9,7 @@ homepage = "https://github.com/rust-lang/regex"
 description = "A regular expression parser."
 workspace = ".."
 edition = "2018"
+rust-version = "1.60.0"
 
 # Features are documented in the "Crate features" section of the crate docs:
 # https://docs.rs/regex-syntax/*/#crate-features