Dependency updates

Updated several dependencies and switch to different totp library.

- Switch oath with totp-lite
  oauth hasn't been updated in a long while and some dependencies could not be updated any more
  It now also validates a preseeding 0, as the previous library returned an int instead of a str which stripped a leading 0
- Updated rust to the current latest nightly (including build image)
- Updated bootstrap css and js
- Updated hadolint to latest version
- Updated default rust image from v1.53 to v1.54
- Updated new nightly build/clippy messages

src/db/mod.rs

@@ -278,7 +278,6 @@ impl<'a, 'r> FromRequest<'a, 'r> for DbConn {
 // https://docs.rs/diesel_migrations/*/diesel_migrations/macro.embed_migrations.html
 #[cfg(sqlite)]
 mod sqlite_migrations {
-    #[allow(unused_imports)]
     embed_migrations!("migrations/sqlite");
 
     pub fn run_migrations() -> Result<(), super::Error> {
@@ -315,7 +314,6 @@ mod sqlite_migrations {
 
 #[cfg(mysql)]
 mod mysql_migrations {
-    #[allow(unused_imports)]
     embed_migrations!("migrations/mysql");
 
     pub fn run_migrations() -> Result<(), super::Error> {
@@ -336,7 +334,6 @@ mod mysql_migrations {
 
 #[cfg(postgresql)]
 mod postgresql_migrations {
-    #[allow(unused_imports)]
     embed_migrations!("migrations/postgresql");
 
     pub fn run_migrations() -> Result<(), super::Error> {