Release v5.12.2

• Updated dependencies.
• Fixed lint issues and modernized some code.
• Fixed fsutil test on newer Go toolchains. (#292 @fnoopv)
• Fixed a panic in the recovery middleware if the panic value is an empty slice or a slice containing only nil values. (#293 @fnoopv)
• Fixed 500 error caused by auth.BasicAuthenticator if the user is not found. (#291 @fnoopv)