go.dev/VERSION format seems to have changed breaking this action

[f0o]

https://go.dev/VERSION?m=text now yields:

go1.21rc4
time 2023-08-01T22:09:51Z

which leads to curl trying to download 3 URLs:

2023-08-08T14:39:23.7711800Z +++ curl 'https://go.dev/VERSION?m=text'
2023-08-08T14:39:23.7760313Z   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
2023-08-08T14:39:23.7760791Z                                  Dload  Upload   Total   Spent    Left  Speed
2023-08-08T14:39:23.7761022Z 
2023-08-08T14:39:23.9433320Z   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
2023-08-08T14:39:23.9434218Z 100    36  100    36    0     0    214      0 --:--:-- --:--:-- --:--:--   214
2023-08-08T14:39:23.9458577Z ++ GO_LINUX_PACKAGE_URL='https://go.dev/dl/go1.21rc4
2023-08-08T14:39:23.9461535Z time 2023-08-01T22:09:51Z.linux-amd64.tar.gz'
2023-08-08T14:39:23.9486212Z ++ [[ '' == \g\o\.\m\o\d ]]
2023-08-08T14:39:23.9488814Z ++ [[ '' == \1\.\1\9 ]]
2023-08-08T14:39:23.9489582Z ++ [[ '' == \1\.\1\8 ]]
2023-08-08T14:39:23.9490344Z ++ [[ '' == \1\.\1\7 ]]
2023-08-08T14:39:23.9491097Z ++ [[ '' == \1\.\1\6 ]]
2023-08-08T14:39:23.9491810Z ++ [[ '' == \1\.\1\5 ]]
2023-08-08T14:39:23.9492555Z ++ [[ '' == \1\.\1\4 ]]
2023-08-08T14:39:23.9493107Z ++ [[ '' == \1\.\1\3 ]]
2023-08-08T14:39:23.9493838Z ++ [[ '' == http* ]]
2023-08-08T14:39:23.9494591Z ++ [[ -n '' ]]
2023-08-08T14:39:23.9496176Z ++ wget --progress=dot:mega https://go.dev/dl/go1.21rc4 time 2023-08-01T22:09:51Z.linux-amd64.tar.gz -O go-linux.tar.gz
2023-08-08T14:39:23.9519570Z --2023-08-08 14:39:23--  https://go.dev/dl/go1.21rc4
2023-08-08T14:39:24.0028563Z Resolving go.dev (go.dev)... 216.239.34.21, 216.239.36.21, 216.239.32.21, ...
2023-08-08T14:39:24.0126311Z Connecting to go.dev (go.dev)|216.239.34.21|:443... connected.
2023-08-08T14:39:24.1459739Z HTTP request sent, awaiting response... 200 OK
2023-08-08T14:39:24.1460225Z Length: 266 [text/html]
2023-08-08T14:39:24.1460799Z Saving to: 'go-linux.tar.gz'
2023-08-08T14:39:24.1461037Z 
2023-08-08T14:39:24.1461230Z      0K                                                      100% 4.89M=0s
2023-08-08T14:39:24.1461468Z 
2023-08-08T14:39:24.1461798Z 2023-08-08 14:39:24 (4.89 MB/s) - 'go-linux.tar.gz' saved [266/266]
2023-08-08T14:39:24.1462508Z 
2023-08-08T14:39:24.1462770Z --2023-08-08 14:39:24--  http://time/
2023-08-08T14:39:24.1690735Z Resolving time (time)... failed: Name or service not known.
2023-08-08T14:39:24.1691612Z wget: unable to resolve host address 'time'
2023-08-08T14:39:24.1692710Z --2023-08-08 14:39:24--  ftp://2023-08-01t22/09:51Z.linux-amd64.tar.gz
2023-08-08T14:39:24.1693541Z            => 'go-linux.tar.gz'
2023-08-08T14:39:24.2100921Z Resolving 2023-08-01t22 (2023-08-01t22)... failed: Name or service not known.
2023-08-08T14:39:24.2101935Z wget: unable to resolve host address '2023-08-01t22'
2023-08-08T14:39:24.2102600Z FINISHED --2023-08-08 14:39:24--
2023-08-08T14:39:24.2103016Z Total wall clock time: 0.3s
2023-08-08T14:39:24.2103558Z Downloaded: 1 files, 266 in 0s (4.89 MB/s)

I guess we have to curl https://go.dev/VERSION?m=text | head -n1 now to only obtain the first line and discard the timestamp