Bump MSRV from 1.56 to 1.66

     error[E0599]: no method named `wrapping_add_signed` found for type `usize` in the current scope
       --> /Users/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/unicode-width-0.1.14/src/tables.rs:407:22
        |
    407 |                 (sum.wrapping_add_signed(isize::from(add)), info)
        |                      ^^^^^^^^^^^^^^^^^^^ method not found in `usize`

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         toolchain:
           - stable
-          - '1.56'
+          - '1.66'
           - nightly
         os:
           - ubuntu
@@ -48,8 +48,7 @@ jobs:
         run: cargo run --package argp --example simple_example two --fooey
 
       - name: Report size overhead
-        # 1.56 doesn't support -C strip.
-        if: matrix.os != 'windows' && matrix.toolchain != '1.56'
+        if: matrix.os != 'windows'
         run: ./scripts/report-size-overhead
 
   lint:

argp/Cargo.toml

@@ -3,7 +3,7 @@ name = "argp"
 version = "0.3.0"
 authors = ["Jakub Jirutka <[email protected]>"]
 edition = "2021"
-rust-version = "1.56.0"
+rust-version = "1.66.0"
 keywords = ["args", "arguments", "derive", "cli"]
 license = "BSD-3-Clause"
 description = "Derive-based argument parser optimized for code size"

argp_derive/Cargo.toml

@@ -3,7 +3,7 @@ name = "argp_derive"
 version = "0.3.0"
 authors = ["Jakub Jirutka <[email protected]>"]
 edition = "2021"
-rust-version = "1.56.0"
+rust-version = "1.66.0"
 license = "BSD-3-Clause"
 description = "Derive-based argument parsing optimized for code size"
 repository = "https://github.com/jirutka/argp"