fix: use proxy for wget

[yanksyoon]

Tested command: wget https://github.com/mikefarah/yq/releases/download/v4.34.1/yq_linux_amd64 -O yq -e use_proxy=yes http_proxy=127.0.0.1:8080 https_proxy=127.0.0.1:8080

Output:

--2023-07-04 19:42:58--  http://http_proxy=127.0.0.1:8080/
Resolving http_proxy=127.0.0.1 (http_proxy=127.0.0.1)... failed: Name or service not known.
wget: unable to resolve host address 'http_proxy=127.0.0.1'
--2023-07-04 19:42:58--  http://https_proxy=127.0.0.1:8080/
Resolving https_proxy=127.0.0.1 (https_proxy=127.0.0.1)... failed: Name or service not known.
wget: unable to resolve host address 'https_proxy=127.0.0.1'
FINISHED --2023-07-04 19:42:58--
Total wall clock time: 1.3s
Downloaded: 1 files, 8.5M in 0.3s (27.6 MB/s)

Due to the stuck test runner (my bad!), attaching a screenshot to show that the tests pass.

[arturo-seijas]

LGTM

[mthaddon]

I'm not sure how much impact this would have but the command will end up having -e before each portion rather than just one as you tested with. Also, I think we may need to take into account the no-proxy setting.