chore: mirror external releases (#2970)

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[create-pull-request](https://github.com/peter-evans/create-pull-request)
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Co-authored-by: aspect-marvin <marvin@aspect.build>

npm/private/versions.bzl

diff --git a/npm/private/versions.bzl b/npm/private/versions.bzl
index db7975f..ef595d3 100644
--- a/npm/private/versions.bzl
+++ b/npm/private/versions.bzl
@@ -166,4 +166,5 @@
     "11.18.0": "sha512-M9g8d9qC9J+6g2klxvG4QRgewxMrZwY5vQEvcHX1x89jTF+HAUfBmq50ePrAHfCdiJLogEVIlu3SPumzN1dWPA==",
     "11.19.0": "sha512-eIHz7VkNRyxKlV4riLISF5ERYGbcyIy8o4SeybYPG7qm0syyIfqR2k4cZb7yvL43k2Wup6xTnHv4be3DobItzg==",
     "11.20.0": "sha512-mm8zCpW2ZEbqCI+vFSFAWooB8H/ecSTMmVjf7VLUu0NnN+ZbCPhfN7Rvy6N1CSVYrFEmK4FoRLIvY0Bu0Wa/7g==",
+    "11.21.0": "sha512-UhcFvOaJkk6scvWjWHEi82JonvZXHlW6gAdv1jfBETLs/62ib61Op5xIW/3b/T1aKlsFgFp36JPeceyKbMo7sQ==",
 }