fix: removing EOL Node version 18 in favor of 20

BREAKING CHANGE:
This will stop support for Node 18 of any dependency of this plugin.

Author: Kaspar Lyngsie

.circleci/config.yml

@@ -9,7 +9,7 @@ orbs:
 defaults: &defaults
   resource_class: small
   docker:
-    - image: cimg/node:18.20
+    - image: cimg/node:20.19
   working_directory: ~/snyk-docker-plugin
 
 windows_defaults: &windows_defaults
@@ -54,10 +54,10 @@ windows_big: &windows_big
 release_defaults: &release_defaults
   resource_class: small
   docker:
-    - image: node:18
+    - image: node:20
   working_directory: ~/snyk-docker-plugin
 
-define: &windows_node_version "18"
+define: &windows_node_version "20.19.1"
 
 commands:
   install_deps:

.nvmrc

@@ -1 +1 @@
-18
+20

appveyor.yml

@@ -17,9 +17,9 @@ cache:
 
 environment:
   matrix:
-    - nodejs_version: "18"
     - nodejs_version: "20"
     - nodejs_version: "22"
+    - nodejs_version: "24"
 
 matrix:
   fast_finish: true

package-lock.json

@@ -25,7 +25,7 @@
     "prepare": "npm run build"
   },
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "dependencies": {
     "@snyk/composer-lockfile-parser": "^1.4.1",