build!: bump MSRV to 1.63

1.63 is the version packaged in Debian 12.

1.48 (packaged in Debian 11) is skipped because:

* Debian 11 is EOL soon (2024-7)
* 1.48 doesn't support rust 2021 edition, making lots of crates unusable
  (notably unicode-width)

This commit also reverts changes in CI for msrv check: it seems
impossible for `--no-dev-deps` to respect the lock file because
`Cargo.toml` is modified.

.github/workflows/rust.yml

@@ -51,9 +51,7 @@ jobs:
     - uses: taiki-e/install-action@cargo-hack
     - uses: Swatinem/rust-cache@v2
 
-    - run: cargo fetch --locked
-
-    - run: cargo hack --feature-powerset --no-dev-deps --rust-version check --workspace --offline
+    - run: cargo hack --feature-powerset --no-dev-deps --rust-version check --workspace
 
   features:
     name: Features ${{ matrix.toolchain }} ${{ matrix.os }}

Cargo.toml

@@ -3,7 +3,7 @@ name = "unicode-truncate"
 version = "0.2.0"
 authors = ["Aetf <[email protected]>"]
 edition = "2018"
-rust-version = "1.48"
+rust-version = "1.63"
 
 homepage = "https://github.com/Aetf/unicode-truncate"
 repository = "https://github.com/Aetf/unicode-truncate"