revert pulldown-cmark from 0.12.2 to 0.10.0 (sigh)

Author: bobhy

Cargo.lock

@@ -5,7 +5,7 @@ members = [".", "examples/remove-emphasis/mdbook-remove-emphasis", "guide"]
 anyhow = "1.0.71"
 clap = { version = "4.3.12", features = ["cargo", "wrap_help"] }
 mdbook = { path = "." }
-pulldown-cmark = { version = "0.12.2", default-features = false, features = [
+pulldown-cmark = { version = "0.10.0", default-features = false, features = [
     "html",
 ] } # Do not update, part of the public api.
 serde = { version = "1.0.163", features = ["derive"] }
@@ -49,7 +49,7 @@ serde.workspace = true
 serde_json.workspace = true
 shlex = "1.3.0"
 tempfile = "3.4.0"
-toml = "0.5.11"                   # Do not update, see https://github.com/rust-lang/mdBook/issues/2037
+toml = "0.5.11"                                                                 # Do not update, see https://github.com/rust-lang/mdBook/issues/2037
 topological-sort = "0.2.2"
 
 # Watch feature

Cargo.toml

@@ -206,7 +206,6 @@ fn render_item(
                 body.push_str(&format!(" [{number}] "));
             }
             Event::TaskListMarker(_checked) => {}
-            Event::InlineMath(_) | Event::DisplayMath(_) => {}
         }
     }