Support SerenityOS Browser in webbrowser module

[linusg]

BPO	44059
Nosy	@gpshead, @linusg, @miss-islington
PRs	bpo-44059: Register the SerenityOS Browser in the webbrowser module #25947 [3.10] bpo-44059: Register the SerenityOS Browser in the webbrowser module (GH-25947) #25950

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/gpshead'
closed_at = <Date 2021-05-06.23:34:37.767>
created_at = <Date 2021-05-06.14:44:55.052>
labels = ['type-feature', 'library']
title = 'Support SerenityOS Browser in webbrowser module'
updated_at = <Date 2021-05-06.23:34:37.766>
user = 'https://github.com/linusg'

bugs.python.org fields:

activity = <Date 2021-05-06.23:34:37.766>
actor = 'gregory.p.smith'
assignee = 'gregory.p.smith'
closed = True
closed_date = <Date 2021-05-06.23:34:37.767>
closer = 'gregory.p.smith'
components = ['Library (Lib)']
creation = <Date 2021-05-06.14:44:55.052>
creator = 'linusg'
dependencies = []
files = []
hgrepos = []
issue_num = 44059
keywords = ['patch']
message_count = 4.0
messages = ['393095', '393131', '393141', '393155']
nosy_count = 3.0
nosy_names = ['gregory.p.smith', 'linusg', 'miss-islington']
pr_nums = ['25947', '25950']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue44059'
versions = []

[linusg]

SerenityOS [1] maintains its own port of Python (currently 3.9.5) [2], with increasingly fewer custom patches. It has its own webbrowser (called "Browser") [3][4], which is the only browser installed by default - as a result, webbrowser.open() currently does not work out of the box. However, register()'ing the browser was straightforward [5]. The goal of this issue is to get that patch into upstream Python.

[1] github.com/SerenityOS/serenity
[2] https://github.com/SerenityOS/serenity/blob/master/Ports/python3
[3] https://github.com/SerenityOS/serenity/tree/master/Userland/Applications/Browser
[4] https://github.com/SerenityOS/serenity/blob/master/Documentation/Browser/ProcessArchitecture.md
[5] SerenityOS/serenity@9f970c3

[gpshead]

Quite a humorous long list of historical browsers still in the webbrowser module. This can join the list. The PR should automerge after the CI runs complete.

[gpshead]

New changeset fbefdaf by Miss Islington (bot) in branch '3.10':
bpo-44059: Register the SerenityOS Browser in the webbrowser module (GH-25947) (GH-25950)
fbefdaf

[gpshead]

thanks for the PR!