Update dependency rsa to v4.7

[mend-for-github-com]

This PR contains the following updates:

Package	Update	Change
rsa (source)	minor	==4.0 -> ==4.7

By merging this PR, the below vulnerabilities will be automatically resolved:

Severity	CVSS Score	CVE
High	7.5	CVE-2020-13757
High	7.5	CVE-2020-25658

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Release Notes

sybrenstuvel/python-rsa (rsa)

v4.7

• Fix picking/unpickling issue introduced in 4.7
  (#​173)

v4.6

Version 4.4 and 4.6 are almost a re-tagged release of version 4.2. It requires
Python 3.5+. To avoid older Python installations from trying to upgrade to RSA
4.4, this is now made explicit in the python_requires argument in setup.py.
There was a mistake releasing 4.4 as "3.5+ only", which made it necessary to
retag 4.4 as 4.6 as well.

No functional changes compared to version 4.2.

v4.5

Version 4.3 and 4.5 are almost a re-tagged release of version 4.0. It is the
last to support Python 2.7. This is now made explicit in the python_requires
argument in setup.py. Python 3.4 is not supported by this release. There was a
mistake releasing 4.4 as "3.5+ only", which made it necessary to retag 4.3 as
4.5 as well.

Two security fixes have also been backported, so 4.3 = 4.0 + these two fixes.

• Choose blinding factor relatively prime to N. Thanks Christian Heimes for pointing this out.
• Reject cyphertexts (when decrypting) and signatures (when verifying) that have
  been modified by prepending zero bytes. This resolves CVE-2020-13757. Thanks
  Carnil for pointing this out.

v4.4

Version 4.4 and 4.6 are almost a re-tagged release of version 4.2. It requires
Python 3.5+. To avoid older Python installations from trying to upgrade to RSA
4.4, this is now made explicit in the python_requires argument in setup.py.
There was a mistake releasing 4.4 as "3.5+ only", which made it necessary to
retag 4.4 as 4.6 as well.

No functional changes compared to version 4.2.

v4.3

Version 4.3 and 4.5 are almost a re-tagged release of version 4.0. It is the
last to support Python 2.7. This is now made explicit in the python_requires
argument in setup.py. Python 3.4 is not supported by this release. There was a
mistake releasing 4.4 as "3.5+ only", which made it necessary to retag 4.3 as
4.5 as well.

Two security fixes have also been backported, so 4.3 = 4.0 + these two fixes.

• Choose blinding factor relatively prime to N. Thanks Christian Heimes for pointing this out.
• Reject cyphertexts (when decrypting) and signatures (when verifying) that have
  been modified by prepending zero bytes. This resolves CVE-2020-13757. Thanks
  Carnil for pointing this out.

v4.2

• Rolled back the switch to Poetry, and reverted back to using Pipenv + setup.py
  for dependency management. There apparently is an issue no-binary installs of
  packages build with Poetry. This fixes
  #​148
• Limited SHA3 support to those Python versions (3.6+) that support it natively.
  The third-party library that adds support for this to Python 3.5 is a binary
  package, and thus breaks the pure-Python nature of Python-RSA.
  This should fix #​147.

v4.1

• Drop support for Python 3.6 (#​209)
  and declare support for 3.11 (#​208).
• Upgrade pytest dependency to fix a security issue.
• Upgrade pytest-cov as well, for good measure.
• Upgrade MyPy (#​211).

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