Log Message:
devel/ruby-test-unit: update to 3.3.9

## 3.3.9 - 2020-12-29 {#version-3-3-9}

### Improvements

  * `assert_not_match`: Add support for `String` as pattern.
    [GitHub#178][Patch by David Rodríguez]

### Thanks

  * David Rodríguez

## 3.3.8 - 2020-12-25 {#version-3-3-8}

### Improvements

  * [UI][console]: Removed reverse mode because Ruby 3.0 reverts
    reverse backtrace.

## 3.3.7 - 2020-11-18 {#version-3-3-7}

### Improvements

  * Improved TruffleRuby support.
    [GitHub#171][Reported by Benoit Daloze]

  * Removed needless `to_sym`.
    [GitHub#177][Patch by icm7216]

  * `assert_raise`: Added backtrace for actual error.

  * Improved terminal color availability detection.
    [GitHub#175][Patch by nicholas a. evans]

  * Changed license to the new Ruby's.
    [GitHub#174]

### Fixes

  * Fixed a typo in `--help` output:
    [GitHub#176][Patch by icm7216]

### Thanks

  * Benoit Daloze

  * icm7216

  * nicholas a. evans