proj: update MSRV to 1.63, commit lockfile

This matches the other Rusticata crates and fixes a build error with
1.60 from `memchr` requiring 1.61+

Note: we have two transitive dependencies that have bumped their MSRV
within otherwise semver compatible versions:

* `winnow` 0.4.2+ requires an MSRV of 1.64.0[0]
* `toml_edit` 0.19.9+ requires an MSRV of 1.64.0[1]

Recently the Rust project guidance on commiting lockfiles for library
projects[2] was changed. They say:

"A lockfile is an appropriate way to pin versions for your project so
you can validate your MSRV"

As a result I've opted to commit a lockfile and use `--locked` in CI to
maintain MSRV. I think this is a better approach than manually working
around the issue with `cargo update --precise` and in line with current
best practices.

[0]: https://github.com/winnow-rs/winnow/blob/v0.6.6/CHANGELOG.md#042---2023-04-28
[1]: https://github.com/toml-rs/toml/blob/main/crates/toml_edit/CHANGELOG.md#0199---2023-05-18
[2]: https://blog.rust-lang.org/2023/08/29/committing-lockfiles.html

.github/workflows/rust.yml

@@ -15,16 +15,14 @@ jobs:
       matrix:
         rust:
           - stable
-          - 1.60.0
+          - 1.63.0
           - nightly
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
-      - name: Cargo update
-        run: cargo update
-      - run: RUSTFLAGS="-D warnings" cargo check
+      - run: RUSTFLAGS="-D warnings" cargo check --locked
 
   test_features:
     name: Test suite (with features)
@@ -40,15 +38,15 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install stable toolchain
         uses: dtolnay/rust-toolchain@stable
-      - run: cargo test ${{ matrix.features }}
+      - run: cargo test --locked ${{ matrix.features }}
 
   no_std:
     name: no-std
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
-      - run: RUSTFLAGS="-D warnings" cargo check --no-default-features
+      - run: RUSTFLAGS="-D warnings" cargo check --locked --no-default-features
 
   fmt:
     name: Rustfmt
@@ -68,7 +66,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: clippy
-      - run: cargo clippy -- -D warnings
+      - run: cargo clippy --locked -- -D warnings
 
   doc:
     name: Build documentation
@@ -78,7 +76,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
-      - run: cargo doc --workspace --no-deps --all-features
+      - run: cargo doc --workspace --no-deps --locked --all-features
 
   semver:
     name: Check semver compatibility

.gitignore

@@ -1,4 +1,3 @@
 .*.swp
 target
-Cargo.lock
 /.idea