Install is FAILING under Windows

[chalin]

Installation as documented in the README is failing now, for example see https://github.com/google/docsy/actions/runs/10251709841/job/28360367004?pr=2061:

build (windows-latest)

curl https://htmltest.wjdp.uk/ | bash -s -- -b tmp/bin
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 10278  100 10278    0     0  82918      0 --:--:-- --:--:-- --:--:-- 84245
wjdp/htmltest info checking GitHub for latest tag
wjdp/htmltest crit unable to find '' - use 'latest' or see https://github.com/wjdp/htmltest/releases for details
make: *** [Makefile:21: get-link-checker] Error 1
Error: Process completed with exit code 1.

It was working fine not too long ago, for example see https://github.com/google/docsy/actions/runs/9371690824/job/25801488137:

build (windows-latest)

curl https://htmltest.wjdp.uk/ | bash -s -- -b tmp/bin
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 10278  100 10278    0     0  71699      0 --:--:-- --:--:-- --:--:-- 73414
wjdp/htmltest info checking GitHub for latest tag
wjdp/htmltest info found version: 0.17.0 for v0.17.0/windows/amd64
Archive:  htmltest_0.17.0_windows_amd64.zip
  inflating: README.md               
  inflating: htmltest.exe            
wjdp/htmltest info installed tmp/bin/htmltest.exe
tmp/bin/htmltest --skip-external
Skipping the checking of external links.
htmltest started at 05:42:42 on public
========================================================================
✔✔✔ passed in 125.0345ms
tested 68 documents

/cc @LisaFC @emckean