Bump node version to current LTS (18)

Author: junderw

Makefile

@@ -9,10 +9,10 @@ prebuildify-cross = ./node_modules/.bin/prebuildify-cross
 # hack, otherwise GitHub Actions for Windows:
 #  '.' is not recognized as an internal or external command, operable program or batch file.
 build-addon:
-	$(prebuildify) --target node@14.0.0 --napi --strip && node -p "process.platform"
+	$(prebuildify) --target node@18.0.0 --napi --strip && node -p "process.platform"
 
 build-addon-linux:
-	$(prebuildify-cross) -i centos7-devtoolset7 -i alpine --target node@14.0.0 --napi --strip
+	$(prebuildify-cross) -i centos7-devtoolset7 -i alpine --target node@18.0.0 --napi --strip
 
 
 nyc = ./node_modules/.bin/nyc