Update dependency highlight.js to ^9.15.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
highlight.js (source)	dependencies	patch	^9.15.6 -> ^9.15.8

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Release Notes

highlightjs/highlight.js

v9.15.8

Compare Source

New languages:
none.
New styles:
none.
Improvements:

• fix(bash): revert escaped double quotes - broke Firefox/Safari.

v9.15.7

Compare Source

New languages:
none.
New styles:
none.
Improvements:

• fix(powershell): Add cmdlets (#​2022)
• fix(Bash): escaped double quotes (#​2041)
• fix(c++): add aliases 'hh', 'hxx', 'cxx' (#​2017)
• fix(ini/toml): Support comments on the same line. (#​2039)
• fix(JSX): not rendering well in a function without parentheses. (#​2024)
• fix(LiveCode): language definition update (#​2021)
• fix(markdown): indented lists (#​2004)
• fix(styles/school-book): don't style all the pre, use .hljs instead (#​2034)
• fix(JSX): Modify JSX tag detection to use XML language regex in place of simplistic \w+

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[codecov]

Codecov Report

Merging #565 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #565      +/-   ##
=========================================
- Coverage   87.72%   87.7%   -0.03%     
=========================================
  Files          25      25              
  Lines        3496    3496              
=========================================
- Hits         3067    3066       -1     
- Misses        429     430       +1

Impacted Files	Coverage Δ
t4/api.py	87.08% <0%> (-0.42%)	⬇️

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