Remove `.travis.yml`?

BPO	46178
Nosy	@vstinner, @Mariatta, @hugovk, @sobolevn
PRs	bpo-46178: remove unusued `.travis.yml` file #30257 bpo-46178: Remove/rename redundant Travis CI code #30309

^{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 = None
closed_at = <Date 2022-01-02.18:27:08.961>
created_at = <Date 2021-12-26.09:34:33.551>
labels = ['type-feature', 'build', '3.11']
title = 'Remove `.travis.yml`?'
updated_at = <Date 2022-01-05.09:18:41.557>
user = 'https://github.com/sobolevn'

bugs.python.org fields:

activity = <Date 2022-01-05.09:18:41.557>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2022-01-02.18:27:08.961>
closer = 'sobolevn'
components = ['Build']
creation = <Date 2021-12-26.09:34:33.551>
creator = 'sobolevn'
dependencies = []
files = []
hgrepos = []
issue_num = 46178
keywords = ['patch']
message_count = 6.0
messages = ['409182', '409183', '409389', '409396', '409508', '409739']
nosy_count = 4.0
nosy_names = ['vstinner', 'Mariatta', 'hugovk', 'sobolevn']
pr_nums = ['30257', '30309']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue46178'
versions = ['Python 3.11']