Issue downloading vimeo videos protected by password

[alexsmithbr]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.06.16.1
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

~/youtube-dl/youtube-dl --verbose 'https://vimeo.com/showcase/7300029/video/434032439' --video-password hsz8k9Klep
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'https://vimeo.com/showcase/7300029/video/434032439', u'--video-password', u'PRIVATE']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.06.16.1
[debug] Python version 2.7.18rc1 (CPython) - Linux-5.4.0-39-generic-x86_64-with-Ubuntu-20.04-focal
[debug] exe versions: ffmpeg 4.2.2, ffprobe 4.2.2, rtmpdump 2.4
[debug] Proxy map: {}
[vimeo] 434032439: Downloading webpage
[vimeo] 434032439: Extracting information
ERROR: Unable to extract info section (caused by ValueError('Extra data: line 1 column 3 - line 1 column 104 (char 2 - 103)',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/home/alexsmith/youtube-dl/youtube-dl/youtube_dl/extractor/vimeo.py", line 658, in _real_extract
    config = json.loads(config)
  File "/usr/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 367, in decode
    raise ValueError(errmsg("Extra data", s, end, len(s)))
ValueError: Extra data: line 1 column 3 - line 1 column 104 (char 2 - 103)
Traceback (most recent call last):
  File "/home/alexsmith/youtube-dl/youtube-dl/youtube_dl/YoutubeDL.py", line 797, in extract_info
    ie_result = ie.extract(url)
  File "/home/alexsmith/youtube-dl/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/home/alexsmith/youtube-dl/youtube-dl/youtube_dl/extractor/vimeo.py", line 671, in _real_extract
    cause=e)
ExtractorError: Unable to extract info section (caused by ValueError('Extra data: line 1 column 3 - line 1 column 104 (char 2 - 103)',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Description

There's no much info to add... Seems like the parser is not working properly for these private videos, even though they play correctly when using the web interface.