Translate `c-api/sequence.po`

[sofide]

This file is 80% translated and needs to reach 100%.

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

Current stats for c-api/sequence.po:

• Total entries: 30

• Entries that need work: 6 - (20%)

  • Fuzzy: 3
  • Untranslated: 3

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