Remove explicit line endings configuration for Spotless

Due to the recent upgrade to Spotless 2.0, it should (theoretically) no
longer be necessary to provide explicit `lineEndings` configuration.

Issue: #404

build.gradle

@@ -96,7 +96,6 @@ allprojects {
 			eclipseFormatFile rootProject.file('src/eclipse/junit-eclipse-formatter-settings.xml')
 
 			trimTrailingWhitespace()
-			lineEndings 'UNIX'
 			endWithNewline()
 
 			custom 'Lambda fix', { it.replace('} )', '})').replace('} ,', '},') }
@@ -396,13 +395,11 @@ configure(rootProject) {
 			target '**/*.gradle', '**/*.gitignore'
 			indentWithTabs()
 			trimTrailingWhitespace()
-			lineEndings 'UNIX'
 			endWithNewline()
 		}
 		format 'documentation', {
 			target '**/*.adoc', '**/*.md'
 			trimTrailingWhitespace()
-			lineEndings 'UNIX'
 			endWithNewline()
 		}
 	}