python3-mako: upgrade 1.3.6 -> 1.3.8

python3-mako: upgrade 1.3.6 -> 1.3.8

Changelog:
===========
- [bug] [lexer] Reverted the fix for #140 released in Mako 1.3.7 as it produced
  regressions in existing user code.
- [bug] [codegen] [lexer] During the lexical analysis phase, add an additional prefix for undeclared
  identifiers that have the same name as built-in flags, and determine the
  final filter to be used during the code generation phase based on the
  context provided by the user.
- [bug] [lexer] Support the direct passing of dictionary literals when calling functions
  and fix the errors caused by nested braces. This revises the fix that was
  released in 1.3.4 and then reverted in 1.3.5.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>