Fix HttpWatch tests

[falbrechtskirchinger]

HttpWatch changed the formatting of the returned JSON. Normalize it by removing all whitespace.

[yhirose]

@falbrechtskirchinger thanks for taking care of this issue! Do you know why some checks failed?

[falbrechtskirchinger]

@falbrechtskirchinger thanks for taking care of this issue! Do you know why some checks failed?

Both PRs combined should fix all the issues. I'll run both commits on one branch through CI to confirm.

[falbrechtskirchinger]

Link to CI run: https://github.com/falbrechtskirchinger/cpp-httplib/actions/runs/13692176609
Link to the branch showing both commits: https://github.com/falbrechtskirchinger/cpp-httplib/commits/refs/heads/fix-tests/

Interestingly, YahooRedirectTest3.SimpleInterface_Online failed once. I checked with my browser and saw that https://yahoo.com/ can return a status code 307 Temporary Redirect and redirect to a location other than https://www.yahoo.com/. If this starts happening more frequently, this test may have to change as well.