[Snyk] Security upgrade codemirror from 5.46.0 to 5.54.0

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
Adding or updating a Snyk policy (.snyk) file; this file is required in order to apply Snyk vulnerability patches. Find out more.

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-CODEMIRROR-569611	No	No Known Exploit

Commit messages

Package name: codemirror

The new version differs by 239 commits.

a5497d1 Mark version 5.54.0
4377c08 [gfm mode] add fencedCodeBlockDefaultMode option
e56014c [soy mode] Fix bug with "map" in type name
8facd90 [vim] Allow Ex-Commands with non-word names
25e7a32 [match-highlighter] Fix issue in highlighting non-alphanumeric tokens
b6ac63e Proper escaping of \s
890cb6b [javascript mode] Fix a runaway regexp
0884405 [runmode addon] Add support for lookahead
a810aee [mode/meta] Remove unwanted space in TiddlyWiki mode name
8e260c2 [dart mode] Add `late` and `required` keywords, `Null` and `Never` types
0de283c [tcl mode] Add # as a lineComment
2e841f6 Add a sponsors section to the website
632f30b Increase size of scrollbar-hack gap
a9774d9 [javascript operator] Properly implement optional chaining operator
b6a75e5 [matchbrackets addon] Disable highlighting when the editor isn't focused
c41dec1 Also ignore clipboard events inside widgets in contenteditable input mode
dfa4bda [runmode standalone] Add support for globalThis
6890f98 Don't mess with the selection when refocusing a text field
a67ed9a [javascript mode] Allow class fields in non-TS mode
46f2723 [javascript mode] Add support for private properties
0b64369 Disable scroll workaround in start-drag handler for Safari
ad54953 [vim bindings] Remove a duplicate entry in defaultExCommandMap
e8c0a77 Disable scroll-on-focus in drag focus kludge
64e4504 [python mode] Somewhat improve handling of format specs in format strings

See the full diff

With a Snyk patch:

Severity	Issue	Exploit Maturity
	Prototype Pollution SNYK-JS-LODASH-567746	Proof of Concept

Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the effected dependencies could be upgraded.

Check the changes in this PR to ensure they won't cause issues with your project.

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

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