spec(deps): use node 20 (MisskeyIO#197)

.github/ISSUE_TEMPLATE/01_bug-report.md

@@ -54,7 +54,7 @@ Please include errors from the developer console and/or server log files if you
 
 * Installation Method or Hosting Service: <!-- Example: docker compose, k8s/docker, systemd, "Misskey install shell script", development environment -->
 * Misskey: 13.x.x
-* Node: 18.x.x
+* Node: 20.x.x
 * PostgreSQL: 15.x.x
 * Redis: 7.x.x
 * OS and Architecture: <!-- Example: Ubuntu 22.04.2 LTS aarch64 -->

.github/workflows/test-backend.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [20.x]
 
     services:
       postgres:

.github/workflows/test-frontend.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [20.x]
 
     steps:
     - uses: actions/checkout@v3.3.0
@@ -51,7 +51,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [18.x]
+        node-version: [20.x]
         browser: [chrome]
 
     services:

.github/workflows/test-misskey-js.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [20.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:

.github/workflows/test-production.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [20.x]
 
     steps:
     - uses: actions/checkout@v3.3.0