textproc/bat: Updates to 0.18.1

- Removes patches to sys-info crate, since the latest release adds
  NetBSD Support.

Changes since 0.18.0:

v0.18.1

Bugfixes

  * Mouse support and screen clearing broken for less versions with minor
    version number (581.2), see #1629 and #1639 (@aswild)

Other

  * Input::ordinary_file and Input::with_name now accept Path rather than
    OsStr see #1571 (@matklad)
  * The LESS environment variable is now included in bat --diagnostic,
    see #1589 (@Enselic)
  * Increased min. required Rust version to 1.45

Syntaxes

  * Improved the Syslog syntax highlighting, see #1606 (@keith-hall)
  * Replaced "Advanced CSV" with a custom CSV syntax definition written
    especially for bat; see #1574 (@keith-hall)
  * Added SystemVerilog file syntax, see #1580 (@SeanMcLoughlin)
  * Added Solidity and Vyper syntax, see #1602 (@Ersikan)

New themes

  * Dark+ VS Code theme, see #1588 and #1598 (@PatriotRossii)

(fox)