doc: reserve 117 for Electron 26

PR-URL: nodejs#48245
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

doc/abi_version_registry.json

@@ -1,5 +1,6 @@
 {
   "NODE_MODULE_VERSION": [
+    { "modules": 117,"runtime": "electron", "variant": "electron",             "versions": "26" },
     { "modules": 116,"runtime": "electron", "variant": "electron",             "versions": "25" },
     { "modules": 115,"runtime": "node",     "variant": "v8_11.3",              "versions": "20.0.0" },
     { "modules": 114,"runtime": "electron", "variant": "electron",             "versions": "24" },