feat: support Gatsby 5.x (#245)

BREAKING CHANGE: Requires Node >=18.0.0
BREAKING CHANGE: Requires Gatsby ^5.0.0

Author: MichaelDeBoey

.github/workflows/validate.yml

@@ -22,7 +22,7 @@ jobs:
     if: ${{ !contains(github.head_ref, 'all-contributors') }}
     strategy:
       matrix:
-        node: [14.15.0, 14, 16, 18, 20]
+        node: [18.0.0, 18, 20]
     runs-on: ubuntu-latest
     steps:
       - name: ⬇️ Checkout repo
@@ -60,7 +60,7 @@ jobs:
         with:
           cache: npm
           cache-dependency-path: ./package.json
-          node-version: 16
+          node-version: 18
 
       - name: 📥 Install deps
         run: npm install

.nvmrc

@@ -1 +1 @@
-14
+18

package.json

@@ -62,10 +62,10 @@
     "remark-html": "^13.0.2"
   },
   "peerDependencies": {
-    "gatsby": "^4.0.0"
+    "gatsby": "^5.0.0"
   },
   "engines": {
-    "node": ">=14.15.0",
+    "node": ">=18.0.0",
     "npm": ">=6"
   }
 }