Update certbot to v4 (major) (#52)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [certbot](https://github.com/certbot/certbot) | major | `==3.3.0` -> `==4.0.0` |
| [certbot-dns-cloudflare](https://github.com/certbot/certbot) | major | `==3.3.0` -> `==4.0.0` |

---

### Release Notes

<details>
<summary>certbot/certbot (certbot)</summary>

### [`v4.0.0`](https://github.com/certbot/certbot/releases/tag/v4.0.0): Certbot 4.0.0

[Compare Source](https://github.com/certbot/certbot/compare/v3.3.0...v4.0.0)

##### Added

-   The --preferred-profile and --required-profile flags allow requesting a profile.
    https://datatracker.ietf.org/doc/draft-aaron-acme-profiles/

##### Changed

-   Certificates now renew with 1/3rd of lifetime left (or 1/2 of lifetime left,
    if the lifetime is shorter than 10 days). This is a change from a hardcoded
    renewal at 30 days before expiration. The config field renew_before_expiry
    still overrides this default.

-   removed `acme.crypto_util._pyopenssl_cert_or_req_all_names`

-   removed `acme.crypto_util._pyopenssl_cert_or_req_san`

-   removed `acme.crypto_util.dump_pyopenssl_chain`

-   removed `acme.crypto_util.gen_ss_cert`

-   removed `certbot.crypto_util.dump_pyopenssl_chain`

-   removed `certbot.crypto_util.pyopenssl_load_certificate`

##### Fixed

-   Moved `RewriteEngine on` directive added during apache http01 authentication
    to the end of the virtual host, so that it overwrites any `RewriteEngine off`
    directives that already exist and allows redirection to the challenge URL.

More details about these changes can be found on our GitHub repo.

</details>

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---

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---

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Reviewed-on: #52
Co-authored-by: Renovate Bot <renovate@mrmeeb.stream>
Co-committed-by: Renovate Bot <renovate@mrmeeb.stream>

requirements.txt

@@ -1,5 +1,5 @@
 # For pinning Python packages to then be parsed by Renovate
 
-certbot ==3.3.0
-certbot-dns-cloudflare ==3.3.0
+certbot ==4.0.0
+certbot-dns-cloudflare ==4.0.0
 apprise ==1.9.3