Log Message:
fonts/ibm-plex-ttf: Update to 4.0.1

Changelog:

# Plex v4.0.1
## Chore
- removed deprecated `arabic` directory from sass distribution
# Plex v4.0
## Breaking
- Added "Sans" to font family name: "IBM Plex Sans Arabic"
## Fixed
- Set bit 67 (Arabic Presentation Forms B) of UnicodeRanges in OS/2 table
# Plex v3.0
## Breaking
- Added "Sans" to Thai and Devanagari family names:
  "IBM Plex Sans Thai" and "IBM Plex Sans Devanagari"
## [IBM PLEX SANS THAI V1.1] - 2019-09-10
### Changed
- Synchronised vertical metrics with IBM Plex Sans Thai Looped 1.1
### Removed
- Glyph /ibmlogo07 (0xEBE7)
### Fixed
- Errors in PS hint replacement in all files containing PostScript outlines
## [IBM PLEX SANS DEVANAGARI V1.1] - 2019-07-19
### Fixed
- Certain font info fields in SemiBold style were incorrectly named \ 
"Medium"
- Many unbalanced bezier handles in extreme points