fix(client): deduplicate concurrent OAuth refreshes - #2757

{ "workflowData": { "owner": "modelcontextprotocol", "repo": "typescript-sdk", "sha": "a8335db24d824d248d1c13ff4006a0852cf7a0d7", "ref": "2757", "headBranch": null }, "key": "DIMsuWN11H", "runId": 33909169198, "webhookDebug": { "action": "requested", "head_branch": "fix/deduplicate-concurrent-oauth-refresh", "head_repository_full_name": "CharlesMcMillan/typescript-sdk", "full_name": "modelcontextprotocol/typescript-sdk", "isPullRequest": true, "prNumber": 2757, "prNumberType": "number", "isNewPullRequest": true, "isOldPullRequest": false, "prKey": "CharlesMcMillan/typescript-sdk:fix/deduplicate-concurrent-oauth-refresh", "oldPrDataHash": "dX7XQWJz31", "lookupKey": "CharlesMcMillan/typescript-sdk:fix/deduplicate-concurrent-oauth-refresh", "data": { "owner": "modelcontextprotocol", "repo": "typescript-sdk", "sha": "a8335db24d824d248d1c13ff4006a0852cf7a0d7", "ref": "2757", "headBranch": null } }, "currentCursor": null, "pkgPrNewVersion": "0.0.88" }