Re: buku: update to 4.7.

[Vinfall <Vinfall@users.noreply.github.com>]

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New comment by Vinfall on void-packages repository

https://github.com/void-linux/void-packages/pull/40526#issuecomment-1315007211

Comment:
Hi, I made the fix PR for buku and was intended to make a PR in Void too XD.

How can I apply the patch in the srcpkg template? I checked https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md but it's not mentioned there.

Here is the patch generated using diff (and I don't see why the deleted [0001-Use-system-cacerts.patch](https://github.com/void-linux/void-packages/pull/40526/files#diff-6e78ba16f5c2d7f44e64e468d85373294be40a96480f1215549e8f639c5a742b) uses a different format):

```patch
--- a/buku	2022-11-15 08:58:58.241422014 +0000
+++ b/buku	2022-11-15 09:04:34.221396456 +0000
@@ -19,10 +19,10 @@
 
 import argparse
 import calendar
-import cgi
 import codecs
 import collections
 import contextlib
+import email.message
 import json
 import locale
 import logging
@@ -3811,15 +3811,17 @@
         if soup.meta and soup.meta.get('charset') is not None:
             charset = soup.meta.get('charset')
         elif 'content-type' in resp.headers:
-            _, params = cgi.parse_header(resp.headers['content-type'])
-            if params.get('charset') is not None:
-                charset = params.get('charset')
+            m = email.message.Message()
+            m['content-type'] = resp.headers['content-type']
+            if m.get_param('charset') is not None:
+                charset = m.get_param('charset')
 
         if not charset and soup:
             meta_tag = soup.find('meta', attrs={'http-equiv': 'Content-Type'})
             if meta_tag:
-                _, params = cgi.parse_header(meta_tag.attrs['content'])
-                charset = params.get('charset', charset)
+                m = email.message.Message()
+                m['content'] = meta_tag.attrs['content']
+                charset = m.get_param('charset', charset)
 
         if charset:
             LOGDBG('charset: %s', charset)
```