dist/http: Enable Reqwest Rustls backend

[philn]

Working around a Reqwest bug where the openssl backend ignores root certificates. See also:
seanmonstar/reqwest#1260

Fixes #2396

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.87%. Comparing base (3ad5944) to head (8939726).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dist/http.rs	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (3ad5944) and HEAD (8939726). Click for more details.

HEAD has 11 uploads less than BASE

Flag	BASE (3ad5944)	HEAD (8939726)
	13	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2633       +/-   ##
===========================================
- Coverage   72.38%   36.87%   -35.51%     
===========================================
  Files          68       54       -14     
  Lines       37219    14648    -22571     
===========================================
- Hits        26941     5402    -21539     
+ Misses      10278     9246     -1032     

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