getmail: deprecate & fix install

[n-thumann]

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According to https://pyropus.ca./software/getmail/documentation.html#python3 getmail only supports Python 2 and should therefore be deprecated. I installed it manually and can confirm that it doesn't run on Python 3.

Part of #86422 (but no longer needed since deprecation).
Not part of, but related to Python 2 deprecations in #93940.
Depends on Homebrew/brew#14004 to fix the downloading.

This Formula also requires brewed curl, because downloading it using a older version of curl fails:

➜  ~ /usr/bin/curl -V && /usr/bin/curl https://pyropus.ca/software/getmail/old-versions/getmail-5.15.tar.gz -L --max-redirs 25
curl 7.79.1 (x86_64-apple-darwin21.0) libcurl/7.79.1 (SecureTransport) LibreSSL/3.3.6 zlib/1.2.11 nghttp2/1.45.1
Release-Date: 2021-09-22
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS GSS-API HSTS HTTP2 HTTPS-proxy IPv6 Kerberos Largefile libz MultiSSL NTLM NTLM_WB SPNEGO SSL UnixSockets
curl: (47) Maximum (25) redirects followed

Brewed curl, however, can

➜  ~ curl -V && curl https://pyropus.ca/software/getmail/old-versions/getmail-5.15.tar.gz -L --max-redirs 25
curl 7.85.0 (x86_64-apple-darwin21.5.0) libcurl/7.85.0 (SecureTransport) OpenSSL/1.1.1q zlib/1.2.11 brotli/1.0.9 zstd/1.5.2 libidn2/2.3.3 libssh2/1.10.0 nghttp2/1.50.0 librtmp/2.3
Release-Date: 2022-08-31
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz MultiSSL NTLM NTLM_WB SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd
Warning: Binary output can mess up your terminal. Use "--output -" to tell
Warning: curl to output it to your terminal anyway, or consider "--output
Warning: <FILE>" to save to a file.

[n-thumann]

In case you're wondering: The CI fails, because Python 2 is obviously is required. When pointing /usr/bin/python to Python 2 locally brew test getmail works :)

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[chenrui333]

since we just disable the formula in here, maybe just a syntax build would be good enough?

[BrewTestBot]

🤖 A scheduled task has triggered a merge.