Bump MSRV to 1.56 to get access to Rust 2021 crates

I noticed in rust-lang#1062 that mdBook does not yet use the Rust 2021 edition. This 2021 edition was made stable in the 1.56 release on 2021-10-21. The previous MSRV (1.54) was released on 2021-07-29.
mgeisler · Jul 28, 2022 · fe0c1b2 · fe0c1b2
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diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -32,7 +32,7 @@ jobs:
           - build: msrv
             os: ubuntu-latest
             # sync MSRV with docs: guide/src/guide/installation.md
-            rust: 1.54.0
+            rust: 1.56.0
     steps:
     - uses: actions/checkout@master
     - name: Install Rust

diff --git a/guide/src/guide/installation.md b/guide/src/guide/installation.md
@@ -20,7 +20,7 @@ To make it easier to run, put the path to the binary into your `PATH`.
 
 To build the `mdbook` executable from source, you will first need to install Rust and Cargo.
 Follow the instructions on the [Rust installation page].
-mdBook currently requires at least Rust version 1.54.
+mdBook currently requires at least Rust version 1.56 (the 2021 edition).
 
 Once you have installed Rust, the following command can be used to build and install mdBook: