modernise reflect.SliceHeader to unsafe.Slice

[calmh]

Avoid the unsafe use of reflect.StringHeader, using the same pattern already in place in bindText, and modernise deprecated reflect.SliceHeader usage to unsafe.Slice.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.61%. Comparing base (18cdded) to head (fed9970).
⚠️ Report is 80 commits behind head on master.

Files with missing lines	Patch %	Lines
sqlite3_context.go	0.00%	4 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1400      +/-   ##
==========================================
+ Coverage   47.16%   51.61%   +4.45%     
==========================================
  Files          12       13       +1     
  Lines        1533     1856     +323     
==========================================
+ Hits          723      958     +235     
- Misses        669      739      +70     
- Partials      141      159      +18     

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