chore(deps): update dependency rsa to v4.8

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rsa	==4.7 -> ==4.8

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[NimJay]

requirements.txt was not updated.
I ticked the checkbox in the PR's description: "If you want to rebase/retry this PR, click this checkbox."
Renovate Bot's behaviour is inconsistent. In #765, the requirements.txt file was updated for one (of the two) microservices.

[NimJay]

All requirements.txt files are now updated thanks to #780.

But the Github checks contain an error during the Docker-build of loadgenerator.
Namely, running:

pip install --prefix="/install" -r requirements.txt

results in:

ERROR: Could not find a version that satisfies the requirement charset-normalizer==2.0.10 (from versions: 0.1a0, 0.1.1a0, 0.1.2b0, 0.1.4b0, 0.1.5b0, 0.1.7, 0.1.8, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.3.0, 1.0.0, 1.1.0, 1.1.1, 1.2.0, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6, 1.3.7, 1.3.8, 1.3.9, 1.4.0, 1.4.1, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9)
ERROR: No matching distribution found for charset-normalizer==2.0.10
WARNING: You are using pip version 21.2.4; however, version 21.3.1 is available.

Same error in #765, #775 (this PR), and #794.

[mathieu-benoit]

Was able to successfully test this PR in there: http://35.184.10.29, but there is still the update in this file src/emailservice/requirements.in missing.

[bourgeoisor]

LGTM