Run clippy on tests and examples

src/configure/auto_mozilla.rs

@@ -268,6 +268,8 @@ pub(crate) async fn moz_autoconfigure(
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
+
     use super::*;
 
     #[test]

src/configure/auto_outlook.rs

@@ -209,6 +209,8 @@ pub(crate) async fn outlk_autodiscover(
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
+
     use super::*;
 
     #[test]

src/configure/mod.rs

@@ -498,6 +498,7 @@ pub enum Error {
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
 
     use super::*;
     use crate::config::*;