chore(deps): update dependency kramdown to v2.3.1

[mend-for-jackfan.us.kg]

This PR contains the following updates:

Package	Update	Change
kramdown (source)	patch	2.3.0 -> 2.3.1

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
Critical	9.8	CVE-2021-28834	#48

---

• If you want to rebase/retry this PR, check this box

[mend-for-jackfan.us.kg]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: Gemfile.lock

[04:24:10.725] INFO (586897): Installing tool [email protected]...
installing v2 tool ruby v2.6.5
Download failed: https://github.com/containerbase/ruby-prebuild/releases/download/2.6.5/ruby-2.6.5-jammy-x86_64.tar.xz
Download failed, retrying
Download failed: https://github.com/containerbase/ruby-prebuild/releases/download/2.6.5/ruby-2.6.5-jammy-x86_64.tar.xz
Download failed, retrying
Download failed: https://github.com/containerbase/ruby-prebuild/releases/download/2.6.5/ruby-2.6.5-jammy-x86_64.tar.xz
Download failed: https://github.com/containerbase/ruby-prebuild/releases/download/2.6.5/ruby-2.6.5-jammy-x86_64.tar.xz
[04:24:11.518] INFO (586965): Downloading file ...
    url: "https://github.com/containerbase/ruby-prebuild/releases/download/2.6.5/ruby-2.6.5-jammy-x86_64.tar.xz"
    output: "/tmp/renovate/containerbase/938b580e74cb7a24b018d01887fefc3a5cf4f9d0829f7e3f2741270e032b812d/ruby-2.6.5-jammy-x86_64.tar.xz"
[04:24:11.562] ERROR (586965): Response code 404 (Not Found)
[04:24:11.562] FATAL (586965): Download failed in 44ms.
[04:24:11.609] ERROR (586897): Command failed with exit code 1: /usr/local/containerbase/bin/install-tool.sh ruby 2.6.5
[04:24:11.609] FATAL (586897): Install tool ruby failed in 889ms.