fix: highlight != as operator

Author: istudyatuni

Typst.sublime-syntax

@@ -22,7 +22,7 @@ variables:
   greeks: (alpha|beta|gamma|delta|epsilon|varepsilon|zeta|eta|theta|vartheta|iota|gamma|kappa|lambda|mu|nu|xi|pi|varpi|rho|varrho|sigma|varsigma|tau|upsilon|phi|varphi|chi|psi|omega|Gamma|Delta|Theta|Lambda|Xi|Pi|Sigma|Upsilon|Phi|Psi|Omega)
   non_raw_ident: '[[:alpha:]][-_[:alnum:]]*|_[-_[:alnum:]]+'
   identifier: '(?:{{non_raw_ident}})'
-  operators: ([+*/]=?|\B-=?|=>|==?|[<>]=?|\bnot\s+in\b)
+  operators: ([+*/]=?|!=|\B-=?|=>|==?|[<>]=?|\bnot\s+in\b)
   prefixes: (?:(?:include|import|set|let|if|for|while|show|context|regex)\b)
   not_begin_of_emph: '[a-zA-Z0-9]'
   not_end_of_emph: '[a-zA-Z0-9]'