Pin markdown version to fix build error

markdown made a breaking change between 1.0.0-alpha.20 and 1.0.0-alpha.21
which made genemichaels stop building.

genemichaels never updated (as a library) to fix that,
so if we want to continue using it we have to ping markdown.

The error:

error[E0599]: no variant or associated item named `BlockQuote` found for enum `Node` in the current scope
   --> [path-to]\genemichaels-0.1.21\src\comments.rs:633:15
    |
633 |         Node::BlockQuote(x) => {
    |               ^^^^^^^^^^ variant or associated item not found in `Node`
    |
help: there is a variant with a similar name
    |
633 |         Node::Blockquote(x) => {
    |               ~~~~~~~~~~

Cargo.lock

@@ -102,6 +102,7 @@ dependencies = [
  "ctrlc",
  "genemichaels",
  "libloading",
+ "markdown",
  "owo-colors",
  "proc-macro2",
  "quote",

Cargo.toml

@@ -24,6 +24,7 @@ anyhow = "1.0.65"
 clap = { version = "4.0.29", features = ["derive"] }
 ctrlc = "3.2.5"
 genemichaels = "0.1.21"
+markdown = { version = "=1.0.0-alpha.14" } # pinning the version to ensure genemichaels builds.
 libloading = "0.8.0"
 owo-colors = "3.5.0"
 proc-macro2 = { version = "1.0.48", features = ["span-locations"] }