Log Message:
vala: update to 0.54.3.

Vala 0.54.3
===========
 * Various improvements and bug fixes:
  - codegen: Actually free data when using "remove(_all)"
    on GLib.Queue/(S)List [#1238]
  - vala:
    + Parameter following ellipsis parameter is not allowed [#1237]
    + More thorough check of ValueType and set CodeNode.error on failure
    + Really check compatiblity of error types for delegate symbol
    + Correctly output signature of callable throwing error
    + Report error for non ErrorType in throws
    + Implement CodeWriter.visit_foreach_statement()/visit_catch_clause()
  - parser: Make sure ErrorCodes are accessible as needed
  - girparser: Add support for "ref_/ref_sink_/unref_function"
    metadata for classes [#1233]