fix: upgrade to newer npm version for maybe fixing windows build

Author: simschla

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/NpmTestsWithoutNpmInstallationTest.java

@@ -34,8 +34,8 @@ void useNodeAndNpmFromNodeGradlePlugin() throws Exception {
 					"repositories { mavenCentral() }",
 					"node {",
 					"    download = true",
-					"    version = '18.13.0'",
-					"    npmVersion = '8.19.2'",
+					"    version = '18.16.1'",
+					"    npmVersion = '9.5.1'",
 					"    workDir = file(\"${buildDir}/nodejs\")",
 					"    npmWorkDir = file(\"${buildDir}/npm\")",
 					"}",
@@ -111,7 +111,7 @@ void useNpmFromNodeGradlePlugin() throws Exception {
 					"repositories { mavenCentral() }",
 					"node {",
 					"    download = true",
-					"    version = '18.13.0'",
+					"    version = '18.16.1'",
 					"    workDir = file(\"${buildDir}/nodejs\")",
 					"}",
 					"def prettierConfig = [:]",

plugin-gradle/src/test/resources/com/diffplug/gradle/spotless/NpmTestsWithoutNpmInstallationTest_gradle_node_plugin_example_1.gradle

@@ -9,8 +9,8 @@ plugins {
 repositories { mavenCentral() }
 node {
     download = true
-    version = '18.13.0'
-    npmVersion = '8.19.2'
+    version = '18.16.1'
+    npmVersion = '9.5.1'
 	// when setting both these directories, npm and node will be in separate directories
     workDir = file("${buildDir}/nodejs")
     npmWorkDir = file("${buildDir}/npm")

plugin-gradle/src/test/resources/com/diffplug/gradle/spotless/NpmTestsWithoutNpmInstallationTest_gradle_node_plugin_example_2.gradle

@@ -9,7 +9,7 @@ plugins {
 repositories { mavenCentral() }
 node {
     download = true
-    version = '18.13.0'
+    version = '18.16.1'
 	// when not setting an explicit `npmWorkDir`, the npm binary will be installed next to the node binary
     workDir = file("${buildDir}/nodejs")
 }