chore: Upgrade mammoth

package.json

@@ -128,7 +128,7 @@
     "koa-sslify": "5.0.1",
     "koa-useragent": "^4.1.0",
     "lodash": "^4.17.21",
-    "mammoth": "^1.4.19",
+    "mammoth": "^1.5.1",
     "markdown-it": "^13.0.1",
     "markdown-it-container": "^3.0.0",
     "markdown-it-emoji": "^2.0.0",

yarn.lock

@@ -9424,10 +9424,10 @@ makeerror@1.0.12:
   dependencies:
     tmpl "1.0.5"
 
-mammoth@^1.4.19:
-  version "1.4.19"
-  resolved "https://registry.yarnpkg.com/mammoth/-/mammoth-1.4.19.tgz#7a4d82e0656a824a568746df5fafefdee78c892e"
-  integrity sha512-VgqsTvBeA1JrNDYMLp+QX5LQPkVPOgl+TKCDklRBedb9Kuv2i7jT+Tgwst8k6mqzH3AchuViiHmBd875Msfivg==
+mammoth@^1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/mammoth/-/mammoth-1.5.1.tgz#ef979dfc9ea411e5f2841a989f5ba70e115f0536"
+  integrity sha512-7ZioZBf/1HjYrm1qZJOO+DD+rYxLvwrHS+HVOwW89hwIp+r6ZqJ/Eq2rXSS+8ezZ3/DuW6FUUp2Dfz6e7B2pBQ==
   dependencies:
     argparse "~1.0.3"
     bluebird "~3.4.0"