Raise minimum tested compiler to 1.74

Required by newest versions of clap and clap_lex.

error: package `clap_lex v0.7.0` cannot be built because it requires rustc 1.74 or
newer, while the currently active rustc version is 1.70.0
Either upgrade to rustc 1.74 or newer, or use
cargo update -p clap_lex@0.7.0 --precise ver
where `ver` is the latest version of `clap_lex` supporting rustc 1.70.0

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [nightly, beta, stable, 1.70.0]
+        rust: [nightly, beta, stable, 1.74.0]
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v3