Translate `library/contextvars.po`

[sofide]

This file is 82% translated and needs to reach 100%.

The rendered version of this file will be available at https://docs.python.org/es/3.13/library/contextvars.html once translated. Meanwhile, the English version is shown.

Current stats for library/contextvars.po:

• Total entries: 51

• Entries that need work: 9 - (18%)

  • Fuzzy: 4
  • Untranslated: 5

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