fix: update broken link for Statistical Fundamentals book (#13044)

[ayushgupta704]

What does this PR do?

✅Remove resource(s) (old broken link)
✅Add resource(s) (new working PDF link)

IMPORTANT

✅Read our contributing guidelines.
✅Is this a revision of a previously submitted PR? No.

For resources
Description:

Replaced the broken PDF link for Fundamentos Estatísticos de Ciência dos Dados (R section, Portuguese books) with a working PDF link.

Why is this valuable (or not)?

Maintains the quality of the repository by ensuring all resources are accessible.

How do we know it's really free?

The PDF is publicly available from the official university repository: biblioteca.unisced.edu.mz.

For book lists, is it a book? For course lists, is it a course? etc.

Yes, it is a book.

Checklist:

✅Search
for duplicates.

✅Include author(s) and platform where appropriate.

✅Put lists in alphabetical order, correct spacing.

✅Add needed indications (PDF, access notes, under construction).

✅Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-pt_BR.md
 3:1-64:24  warning  Alphabetical ordering: swap l.4 and l.3    alphabetize-lists            remark-lint
  3:1-3:20  warning  Marker style should be `*`                 unordered-list-marker-style  remark-lint
  4:1-8:52  warning  Marker style should be `*`                 unordered-list-marker-style  remark-lint
  5:3-5:40  warning  Marker style should be `*`                 unordered-list-marker-style  remark-lint
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21:3-23:22  warning  Alphabetical ordering: swap l.22 and l.21  alphabetize-lists            remark-lint
21:3-21:96  warning  Marker style should be `*`                 unordered-list-marker-style  remark-lint
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62:1-62:31  warning  Marker style should be `*`                 unordered-list-marker-style  remark-lint
63:1-64:24  warning  Marker style should be `*`                 unordered-list-marker-style  remark-lint
64:3-64:24  warning  Marker style should be `*`                 unordered-list-marker-style  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-pt_BR.md
3:1-64:24  warning  Alphabetical ordering: swap l.4 and l.3  alphabetize-lists  remark-lint