Revert yaml module to v1.8.3

CommonJS build of yaml v1.9.0 throws error `Duplicate export 'YAML'`
while building via rollup.

yaml v1.9.0 has supported ES modules through "exports" field.
(eemeli/yaml#145) However, rollup bundler cannot
recognize it in any plugins.
(rollup/plugins#208)

package.json

@@ -244,7 +244,7 @@
     "typescript": "^3.8.3",
     "unified": "^9.0.0",
     "unist-util-visit": "^2.0.2",
-    "yaml": "^1.9.0"
+    "yaml": "~1.8.3"
   },
   "dependencies": {
     "@marp-team/marp-cli": "^0.17.4",

yarn.lock

@@ -219,7 +219,7 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.8.0"
 
-"@babel/runtime@^7.9.0":
+"@babel/runtime@^7.8.7", "@babel/runtime@^7.9.0":
   version "7.9.2"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.9.2.tgz#d90df0583a3a252f09aaa619665367bae518db06"
   integrity sha512-NE2DtOdufG7R5vnfQUTehdTfNycfUANEtCa9PssN9O/xmTzP4E08UI797ixaei6hBEVL9BI/PsdJS5x7mWoB9Q==
@@ -6676,13 +6676,20 @@ y18n@^4.0.0:
   resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.0.tgz#95ef94f85ecc81d007c264e190a120f0a3c8566b"
   integrity sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==
 
-yaml@^1.7.2, yaml@^1.9.0:
+yaml@^1.7.2:
   version "1.9.0"
   resolved "https://registry.yarnpkg.com/yaml/-/yaml-1.9.0.tgz#dc1ff3e24837b62bc3c8ae02c28e16ee5742b9d6"
   integrity sha512-3GLZOj8A9Gsp0Fw3kOyj0zqk4xMq+YvhbHSDYALd2NMOfIpyZeBhz32ZiNU7AtX1MtXX/9JJgxSElGRwvv9enA==
   dependencies:
     "@babel/runtime" "^7.9.0"
 
+yaml@~1.8.3:
+  version "1.8.3"
+  resolved "https://registry.yarnpkg.com/yaml/-/yaml-1.8.3.tgz#2f420fca58b68ce3a332d0ca64be1d191dd3f87a"
+  integrity sha512-X/v7VDnK+sxbQ2Imq4Jt2PRUsRsP7UcpSl3Llg6+NRRqWLIvxkMFYtH1FmvwNGYRKKPa+EPA4qDBlI9WVG1UKw==
+  dependencies:
+    "@babel/runtime" "^7.8.7"
+
 yargs-parser@18.x, yargs-parser@^18.1.1:
   version "18.1.3"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-18.1.3.tgz#be68c4975c6b2abf469236b0c870362fab09a7b0"