build(deps): Update pulldown-cmark to 0.13 (#1259)

* build(deps): update pulldown-cmark requirement from 0.12 to 0.13

Updates the requirements on [pulldown-cmark](https://github.com/raphlinus/pulldown-cmark) to permit the latest version.
- [Release notes](https://github.com/raphlinus/pulldown-cmark/releases)
- [Commits](pulldown-cmark/pulldown-cmark@v0.12.0...v0.13.0)

---
updated-dependencies:
- dependency-name: pulldown-cmark
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* build(deps): update pulldown-cmark-to-cmark requirement to 21

Updates the requirements on [pulldown-cmark-to-cmark](https://github.com/Byron/pulldown-cmark-to-cmark) to permit the latest version.
- [Release notes](https://github.com/Byron/pulldown-cmark-to-cmark/releases)
- [Changelog](https://github.com/Byron/pulldown-cmark-to-cmark/blob/main/CHANGELOG.md)
- [Commits](Byron/pulldown-cmark-to-cmark@v16.0.0...v21.0.0)

---
updated-dependencies:
- dependency-name: pulldown-cmark-to-cmark
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: caspermeijn

prost-build/Cargo.toml

@@ -31,8 +31,8 @@ prettyplease = { version = "0.2", optional = true }
 syn = { version = "2", features = ["full"], optional = true }
 
 # These two must be kept in sync, used for `cleanup-markdown` feature.
-pulldown-cmark = { version = "0.12", optional = true, default-features = false }
-pulldown-cmark-to-cmark = { version = ">=16, <=20", optional = true }
+pulldown-cmark = { version = "0.13", optional = true, default-features = false }
+pulldown-cmark-to-cmark = { version = "21", optional = true }
 
 [dev-dependencies]
 env_logger = { version = "0.11", default-features = false }