[Enhancement]: applying speed limits to termux_download

[twaik]

Can we please make termux_download retry if speed falls to 0 for 30 seconds or longer?
Sometimes connection stucks for 10 minutes or more so updater-script is simply waiting for new data.
According to curl's man we should use --speed-limit and --speed-time options.

termux-packages/scripts/build/termux_download.sh

Line 21 in 5cf7e74

if curl --fail --retry 20 --retry-connrefused --retry-delay 30 --location --output "$TMPFILE" "$URL"; then

[twaik]

To avoid this:

Downloading https://github.com/pypa/pip/archive/24.1b1.tar.gz
  % 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  160k    0  160k    0     0    266      0 --:--:--  0:10:13 --:--:--     0
curl: (56) OpenSSL SSL_read: Connection timed out, errno 110
Failed to download https://github.com/pypa/pip/archive/24.1b1.tar.gz
ERROR: failed to build.

It was waiting for 10 minutes only to say connection timed out.

[TomJo2000]

To avoid this:

Downloading https://github.com/pypa/pip/archive/24.1b1.tar.gz
  % 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  160k    0  160k    0     0    266      0 --:--:--  0:10:13 --:--:--     0
curl: (56) OpenSSL SSL_read: Connection timed out, errno 110
Failed to download https://github.com/pypa/pip/archive/24.1b1.tar.gz
ERROR: failed to build.

It was waiting for 10 minutes only to say connection timed out.

Huh I was actually working on Pip right now, I found some other stuff I need to look into first, but I updated the regex for valid versions in #20050, could you please double check that I did that correctly if you have a minute?