try using yarn for deploy.yml

.github/workflows/deploy.yml

@@ -17,8 +17,8 @@ jobs:
 
       - name: Install and Build Vuepress
         run: |
-          npm install
-          npm run just-build
+          yarn install
+          yarn just-build
 
       - name: Deploy
         uses: JamesIves/github-pages-deploy-action@4.1.5

package.json

@@ -20,7 +20,7 @@
     "@vuepress/plugin-back-to-top": "^1.9.5",
     "vuepress": "^1.9.5",
     "vuepress-plugin-code-copy": "^1.0.6",
-    "vuepress-plugin-seo": "^0.1.4",
+    "vuepress-plugin-seo": "^0.2.0",
     "vuepress-theme-thindark": "^1.0.1"
   }
 }

yarn.lock

@@ -7170,7 +7170,7 @@ __metadata:
     "@vuepress/plugin-back-to-top": ^1.9.5
     vuepress: ^1.9.5
     vuepress-plugin-code-copy: ^1.0.6
-    vuepress-plugin-seo: ^0.1.4
+    vuepress-plugin-seo: ^0.2.0
     vuepress-theme-thindark: ^1.0.1
   languageName: unknown
   linkType: soft
@@ -11397,10 +11397,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"vuepress-plugin-seo@npm:^0.1.4":
-  version: 0.1.4
-  resolution: "vuepress-plugin-seo@npm:0.1.4"
-  checksum: 3e3a297b6747f8e06a4146141ade3377b63d4b64fc8d99aebbefe8cd1d573d4c2d702799b6da240e2a7b3e3b85e6650ac484e6536455081cb330f7e6e13479ac
+"vuepress-plugin-seo@npm:^0.2.0":
+  version: 0.2.0
+  resolution: "vuepress-plugin-seo@npm:0.2.0"
+  checksum: 6f2dc722199b496e99640e3173d1e6bba05f6eb6258f65b85bf78a0e4a59258d76f45b56c1fe29941be971f9b657801ec6104011f3b2c7545cde02a095e722b9
   languageName: node
   linkType: hard