Remove support for node 18 (#8334)

Author: joehan

Diff for: .github/workflows/node-test.yml

@@ -46,7 +46,6 @@ jobs:
     strategy:
       matrix:
         node-version:
-          - "18"
           - "20"
           - "22"
     steps:
@@ -73,7 +72,6 @@ jobs:
     strategy:
       matrix:
         node-version:
-          - "18"
           - "20"
 
     env:
@@ -132,7 +130,6 @@ jobs:
     strategy:
       matrix:
         node-version:
-          - "18"
           - "20"
           - "22"
     steps:

Diff for: npm-shrinkwrap.json

@@ -69,7 +69,7 @@
   ],
   "preferGlobal": true,
   "engines": {
-    "node": ">=18.0.0 || >=20.0.0 || >=22.0.0"
+    "node": ">=20.0.0 || >=22.0.0"
   },
   "author": "Firebase (https://firebase.google.com/)",
   "license": "MIT",