fix: don't check the stackoverflow link

it's 403ing from CI, presumably because stackoverflow is trying to outwit the robots

w3-account.md

@@ -226,7 +226,10 @@ Examples
 [`did:mailto`]:./did-mailto.md
 [`did:key`]:https://w3c-ccg.github.io/did-method-key/
 [principal]:https://github.com/ucan-wg/spec/blob/692e8aab59b763a783fe1484131c3f40d997b69a/README.md#321-principals
+<!-- markdown-link-check-disable -->
+<!-- stackexchange 403s this, presumably to prevent bot scraping -->
 [non-extractable keys]:https://crypto.stackexchange.com/questions/85587/what-do-people-use-non-extractable-webcrypto-keys-for/102695#102695
+<!-- markdown-link-check-enable-->
 [agent]:#agent
 [account]:#account
 [UCAN-IPLD Schema]:https://github.com/ucan-wg/ucan-ipld/#2-ipld-schema