major syntax highlighting improvements (update syntect_server)

[emidoots]

See the changelog for details, or the linked PR for detailed information: sourcegraph/syntect_server#29

• Fixes sourcegraph/sourcegraph#2885 (Smarty support)
• Fixes sourcegraph/sourcegraph#2440 (Ethereum / Solidity / Vyper support)
• Fixes sourcegraph/sourcegraph#5907 (Cuda support)
• Helps sourcegraph/sourcegraph#10154 (adds COBOL syntax highlighting)
• Fixes sourcegraph/sourcegraph#8123 (Treat .build_defs, .star, and BUILD files as Bazel/Starlark files)
• Helps sourcegraph/sourcegraph#4901 (adds VB.Net syntax highlighting)
• Helps sourcegraph/sourcegraph#4262 (adds ASP.NET syntax highlighting)
• Fixes sourcegraph/sourcegraph#3545 (OCaml support)
• Helps sourcegraph/sourcegraph#9557 (likely fixes, but needs confirmation from customer)

[codecov]

Codecov Report

Merging #10374 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #10374    +/-   ##
========================================
  Coverage   44.32%   44.32%            
========================================
  Files        1409     1409            
  Lines       77211    77211            
  Branches     6946     6760   -186     
========================================
  Hits        34227    34227            
  Misses      39768    39768            
  Partials     3216     3216            

Flag	Coverage Δ
#go	47.35% <ø> (ø)
#typescript	34.98% <ø> (ø)
#unit	44.32% <ø> (ø)