chore: Update Pulldown-cmark to 0.8

The changes seem compatible with what we're using it for.

pulldown-cmark/pulldown-cmark@v0.7.2...v0.8.0

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

Author: kinnison

Cargo.lock

@@ -37,7 +37,7 @@ opener = "0.4.0"
 # Used by `curl` or `reqwest` backend although it isn't imported
 # by our rustup.
 openssl = {version = "0.10", optional = true}
-pulldown-cmark = {version = "0.7", default-features = false}
+pulldown-cmark = {version = "0.8", default-features = false}
 rand = "0.7"
 regex = "1"
 remove_dir_all = "0.6.0"