Bump MSRV to 1.63.0

Bump MSRV and record it for Cargo [1].

Since ce99e39 (Bump MSRV to 1.48.0, 2021-03-13) openSUSE Leap has
effectively died. 15.4 and 15.5 have fewer packages and there won't be
later versions, and instead "Slowroll" is expected to replace Leap
entirely [2]. Slowroll is based on openSUSE Tumbleweed so there will no
longer be an openSUSE laggard release to target.

* Debian "bookworm" (stable)
* Ubuntu 20.04

[1] https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
[2] https://en.opensuse.org/openSUSE:Slowroll

Author: commonquail

.github/workflows/ci.yml

@@ -15,17 +15,16 @@ jobs:
     strategy:
       matrix:
         build:
-          # MSRV, stable, and next.
-          - pinned
+          - msrv
           - stable
           - nightly
           # Use nightly for these because that's what release does.
           - win-msvc
           - macos
         include:
-          - build: pinned
+          - build: msrv
             os: ubuntu-22.04
-            rust: 1.48.0
+            rust: 1.63.0
 
           - build: stable
             os: ubuntu-22.04

.gitlab-ci.yml

@@ -1,7 +1,7 @@
 # https://launchpad.net/rustc
 # https://packages.debian.org/stable/rustc
 # https://software.opensuse.org/package/rust
-image: rust:1.48.0-buster
+image: rust:1.63.0-slim-bullseye # should actually be bookworm
 
 rustfmt:
   script:

Cargo.toml

@@ -9,6 +9,7 @@ repository = "https://gitlab.com/mkjeldsen/commitmsgfmt"
 readme = "README.md"
 license = "Apache-2.0"
 edition = "2018"
+rust-version = "1.63.0"
 
 [dependencies]
 unicode-segmentation = "1.10.1"