Update Node.js to ^18.19.0 (#160)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -2,7 +2,7 @@
   "name": "signed-api",
   "version": "1.0.0",
   "engines": {
-    "node": "^18.18.2",
+    "node": "^18.19.0",
     "pnpm": "^8.11.0"
   },
   "scripts": {

packages/airnode-feed/package.json

@@ -2,7 +2,7 @@
   "name": "airnode-feed",
   "version": "0.1.0",
   "engines": {
-    "node": "^18.18.2",
+    "node": "^18.19.0",
     "pnpm": "^8.11.0"
   },
   "scripts": {

packages/api/package.json

@@ -2,7 +2,7 @@
   "name": "api",
   "version": "0.1.0",
   "engines": {
-    "node": "^18.18.2",
+    "node": "^18.19.0",
     "pnpm": "^8.11.0"
   },
   "main": "index.js",

packages/e2e/package.json

@@ -2,7 +2,7 @@
   "name": "e2e",
   "version": "1.0.0",
   "engines": {
-    "node": "^18.18.2",
+    "node": "^18.19.0",
     "pnpm": "^8.11.0"
   },
   "scripts": {