Bump MSRV to 1.72

Indirect dep target-spec 3.1.0 needs it

.github/workflows/tests.yml

@@ -43,7 +43,7 @@ jobs:
     strategy:
       matrix:
         os: [macOS-latest, ubuntu-latest, windows-latest]
-        version: [stable, nightly, "1.70"]
+        version: [stable, nightly, "1.73"]
 
     runs-on: ${{ matrix.os }}
 

Cargo.toml

@@ -9,7 +9,7 @@ repository = "https://github.com/sourcefrog/cargo-mutants"
 homepage = "https://mutants.rs/"
 categories = ["development-tools::testing"]
 keywords = ["testing", "mutants", "cargo", "mutation-testing", "coverage"]
-rust-version = "1.70"
+rust-version = "1.73"
 exclude = [
     ".codespell*",
     ".markdownlint*",

NEWS.md

@@ -4,6 +4,8 @@
 
 - New: `--features`, `--no-default-features` and `--all-features` options are passed through to Cargo.
 
+- Changed: Minimum Rust version (to build cargo-mutants, not to use it) increased to 1.73.
+
 ## 24.2.0
 
 - New: Colored output can be enabled in CI or other noninteractive situations by passing `--colors=always`, or setting `CARGO_TERM_COLOR=always`, or `CLICOLOR_FORCE=1`. Colors can similarly be forced off with `--colors=never`, `CARGO_TERM_COLOR=never`, or `NO_COLOR=1`.