Update certbot requirement from <6.0,>=1.18.0 to >=4.2.0,<6.0

[dependabot]

Updates the requirements on certbot to permit the latest version.

Release notes

Sourced from certbot's releases.

Certbot 4.2.0

Added

• Added --eab-hmac-alg parameter to support custom HMAC algorithm for External Account Binding. (#10281)

Changed

• Catches and ignores errors during the directory fetch for ARI checking so that these errors do not hinder the actual certificate issuance. (#10342)
• Removed the dependency on pytz. (#10350)
• Deprecated acme.crypto_util.probe_sni (#10386)
• Support for Python 3.9 was deprecated and will be removed in our next planned release. (#10390)

Fixed

• The Certbot snap no longer sets the environment variable PYTHONPATH stopping it from picking up Python files in the current directory and polluting the environment for Certbot hooks written in Python. (#10176, #10257)
• Previously, we claimed to set FAILED_DOMAINS and RENEWED_DOMAINS env variables for use by post-hooks when certificate renewals fail, but we were not actually setting them. Now, we are. (#10259)
• Certbot now always uses the server value from the renewal configuration file for ARI checks instead of the server value from the current invocation of Certbot. This helps prevent ARI requests from going to the wrong server if the user changes CAs. (#10339)

Commits

• 832d11a Release 4.2.0
• 1b209c9 Update changelog for 4.2.0 release
• e9cf7e8 renewal: use early return for empty lineage server (#10392)
• 3d8be0c deprecate python 3.9 (#10390)
• 581977c try and improve should_autorenew comments (#10391)
• d80b1d3 Deprecate acme.crypto_util.probe_sni() (#10387)
• 106d21d modify pyvenv.cfg instead of PYTHONPATH (#10384)
• b782c52 Remove _snap_log_name and put back comments from #9956 (#10385)
• 2b86870 move --eab-hmac-alg from fixed to added (#10383)
• 2ac7baa Add towncrier for automatic changelog generation (#10379)
• Additional commits viewable in compare view

Most Recent Ignore Conditions Applied to This Pull Request

Dependency Name	Ignore Conditions
certbot	[>= 5.dev0, < 6]

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