fix(security): bump markdown-it to 14.2.0 (smartquotes ReDoS) (#21814)

## fix(security): bump markdown-it to 14.2.0 (smartquotes ReDoS)

Resolves [Dependabot Alert
#1511](https://github.com/twentyhq/twenty/security/dependabot/1511).

### What

`markdown-it` `<= 14.1.1` is affected by
[GHSA-6v5v-wf23-fmfq](https://github.com/advisories/GHSA-6v5v-wf23-fmfq)
(**Moderate**) — quadratic-complexity DoS in the smartquotes rule via
`replaceAt` string operations. Patched in `14.2.0`.

### How

`markdown-it` is pulled transitively by `@graphiql/react` (`^14.1.0`)
and `prosemirror-markdown` (`^14.0.0`), both of which already permit
`14.2.0`. This refreshes the lockfile resolution `14.1.1 -> 14.2.0`
within the existing range — no `resolutions` override. It is **not**
imported in our source, and the fix is internal to the smartquotes rule
(no public API change).

### Verification

- `markdown-it` resolves to `14.2.0`; no `<= 14.1.1` copy remains.
- Diff limited to `markdown-it` + its own `linkify-it` dep bump.
- Lockfile-only change; `yarn install --immutable` passes.

yarn.lock

@@ -41197,12 +41197,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"linkify-it@npm:^5.0.0":
-  version: 5.0.0
-  resolution: "linkify-it@npm:5.0.0"
+"linkify-it@npm:^5.0.1":
+  version: 5.0.1
+  resolution: "linkify-it@npm:5.0.1"
   dependencies:
     uc.micro: "npm:^2.0.0"
-  checksum: 10c0/ff4abbcdfa2003472fc3eb4b8e60905ec97718e11e33cca52059919a4c80cc0e0c2a14d23e23d8c00e5402bc5a885cdba8ca053a11483ab3cc8b3c7a52f88e2d
+  checksum: 10c0/d06d04f1ed03be131740fc900a5e74ea1f49886b052213599e306d469d5ffe2303db76dd8f771de9f28e2b0b38852de22ec46ae597d245f8b66439b0ceb19b10
   languageName: node
   linkType: hard
 
@@ -42064,18 +42064,18 @@ __metadata:
   linkType: hard
 
 "markdown-it@npm:^14.0.0, markdown-it@npm:^14.1.0":
-  version: 14.1.1
-  resolution: "markdown-it@npm:14.1.1"
+  version: 14.2.0
+  resolution: "markdown-it@npm:14.2.0"
   dependencies:
     argparse: "npm:^2.0.1"
     entities: "npm:^4.4.0"
-    linkify-it: "npm:^5.0.0"
+    linkify-it: "npm:^5.0.1"
     mdurl: "npm:^2.0.0"
     punycode.js: "npm:^2.3.1"
     uc.micro: "npm:^2.1.0"
   bin:
     markdown-it: bin/markdown-it.mjs
-  checksum: 10c0/c67f2a4c8069a307c78d8c15104bbcb15a2c6b17f4c904364ca218ec2eccf76a397eba1ea05f5ac5de72c4b67fcf115d422d22df0bfb86a09b663f55b9478d4f
+  checksum: 10c0/1d3a50061d2fe4efbcf317aac853dbee6892ed6f5a217570eead723f2ef2dd1c9baaeef5a687cd283480c45c2d20724a73e84a9ed72843cf7b3b719067af40ef
   languageName: node
   linkType: hard