Update dependency dotenv to v16.4.2 (mastodon#29157)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

yarn.lock

@@ -6844,9 +6844,9 @@ __metadata:
   linkType: hard
 
 "dotenv@npm:^16.0.3":
-  version: 16.4.1
-  resolution: "dotenv@npm:16.4.1"
-  checksum: ef3d95f48f38146df0881a4b58447ae437d2da3f6d645074b84de4e64ef64ba75fc357c5ed66b3c2b813b5369fdeb6a4777d6ade2d50e54eed6aa06dddc98bc4
+  version: 16.4.2
+  resolution: "dotenv@npm:16.4.2"
+  checksum: 04373a742f565896de1ab3eadcd15c1543b6d1fc37bb7ab2faa2286a0b3fd432aa02c6fd330ede758432f36865f0fb128afa2e5991e0a789b9011e720ba4a876
   languageName: node
   linkType: hard