[Snyk] Security upgrade markdownlint from 0.24.0 to 0.25.1

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

merge advice

Changes included in this PR

Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
- package.json
- package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	551/1000 Why? Recently disclosed, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-JS-MARKDOWNIT-2331914	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: markdownlint

The new version differs by 82 commits.

2d19c06 Update to version 0.25.1.
61bb059 Make all package.json dependency versions explicit for more deterministic installs.
66d533d Update npx invocation to pass --yes to avoid prompting to install missing packages.
23d8ed7 Add test case for custom rule that imports an ESM module (refs #477).
b1aef98 Empty commit to note that previous commit fixes #478.
f77eca0 Update dependency: markdown-it to 12.3.2.
05b4b5f Update copyright year to 2022.
02707cf Merge branch 'next' into main
4ff4cbc Update to version 0.25.0.
e298e3d Include async/await function in custom rules test for asynchronous mode.
11e9a20 Update dependency: globby to 12.0.2.
05b9e6e Update dependency: strip-json-comments to 4.0.0.
528758e Update dependencies: eslint to 8.5.0, eslint-plugin-jsdoc to 37.4.0.
fd24b95 Remove require("os") from helpers to reduce dependencies for browser scenarios.
9ec14f1 Include custom rule markdownlint-rule-github-internal-links when validating project Markdown files.
5f00406 Deep freeze name/tokens/lines/frontMatterLines properties of params object before passing to (custom) rules for shared access.
5253669 Fix array indexing for markdownlint-disable-next-line when front matter is present.
7a76f1d Update MD039/no-space-in-links to fix reference-style links, be slightly more permissive matching link content.
064a1e3 Update Node version for TestRepos workflow from 12 to 16.
ff8f4ea Reduce execution time by ~50% by updating getEnabledRulesPerLineNumber to make enabledRules immutable and copy only when changed (also, simplify handleInlineConfig slightly).
7cf9c2d Update MD037/no-space-in-emphasis to ignore embedded underscore emphasis markers (fixes #444, fixes #408, fixes #354, fixes #324).
3e8d332 Add test for outdated ignore expressions to markdownlint-test-repos.
6dea678 Update definition of helpers.isBlankLine to treat unterminated start/end comments as potentially blank lines (fixes #431).
1b23976 Update dependencies: eslint-plugin-jsdoc to 37.2.8, eslint-plugin-unicorn to 39.0.0.