with pip install -r requirements.txt i have this error
ERROR: Could not find a version that satisfies the requirement requirements.txt (from versions: none)
ERROR: No matching distribution found for requirements.txt

to solve this I added the -r option

-r, --requirement <file>    Install from the given requirements file. This option can be used multiple times.

without -r can't install requirements

Bumps [lxml](https://github.com/lxml/lxml) from 4.6.3 to 4.6.5.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.6.3...lxml-4.6.5)

---
updated-dependencies:
- dependency-name: lxml
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.3.2 to 9.0.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.3.2...9.0.1)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [notebook](http://jupyter.org) from 6.4.1 to 6.4.10.

---
updated-dependencies:
- dependency-name: notebook
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [pypdf2](https://github.com/py-pdf/PyPDF2) from 1.26.0 to 1.27.5.
- [Release notes](https://github.com/py-pdf/PyPDF2/releases)
- [Changelog](https://github.com/py-pdf/PyPDF2/blob/main/CHANGELOG)
- [Commits](py-pdf/pypdf@1.26.0...1.27.5)

---
updated-dependencies:
- dependency-name: pypdf2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.5.2 to 2.6.4.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v2.5.2...v2.6.4)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

…pillow-9.0.1

Bump pillow from 8.3.2 to 9.0.1

…tensorflow-2.6.4

Bump tensorflow from 2.5.2 to 2.6.4

…pypdf2-1.27.5

Bump pypdf2 from 1.26.0 to 1.27.5

…notebook-6.4.10

Bump notebook from 6.4.1 to 6.4.10

…lxml-4.6.5

Bump lxml from 4.6.3 to 4.6.5