Bump urllib3 from 1.25.3 to 1.25.8

[dependabot-preview[bot]]

Bumps urllib3 from 1.25.3 to 1.25.8.

Release notes

Sourced from urllib3's releases.

1.25.8

Release: 1.25.8

1.25.7

No release notes provided.

1.25.6

Release: 1.25.6

1.25.5

Release: 1.25.5

1.25.4

Release: 1.25.4

Changelog

Sourced from urllib3's changelog.

1.25.8 (2020-01-20)

• Drop support for EOL Python 3.4 (Pull #1774)
• Optimize _encode_invalid_chars (Pull #1787)

1.25.7 (2019-11-11)

• Preserve chunked parameter on retries (Pull #1715, Pull #1734)
• Allow unset SERVER_SOFTWARE in App Engine (Pull #1704, Issue #1470)
• Fix issue where URL fragment was sent within the request target. (Pull #1732)
• Fix issue where an empty query section in a URL would fail to parse. (Pull #1732)
• Remove TLS 1.3 support in SecureTransport due to Apple removing support (Pull #1703)

1.25.6 (2019-09-24)

• Fix issue where tilde (~) characters were incorrectly percent-encoded in the path. (Pull #1692)

1.25.5 (2019-09-19)

• Add mitigation for BPO-37428 affecting Python <3.7.4 and OpenSSL 1.1.1+ which caused certificate verification to be enabled when using cert_reqs=CERT_NONE. (Issue #1682)

1.25.4 (2019-09-19)

• Propagate Retry-After header settings to subsequent retries. (Pull #1607)
• Fix edge case where Retry-After header was still respected even when explicitly opted out of. (Pull #1607)
• Remove dependency on rfc3986 for URL parsing.
• Fix issue where URLs containing invalid characters within Url.auth would raise an exception instead of percent-encoding those characters.
• Add support for HTTPResponse.auto_close = False which makes HTTP responses work well with BufferedReaders and other io module features. (Pull #1652)
• Percent-encode invalid characters in URL for HTTPConnectionPool.request() (Pull #1673)

Commits

• 2a57bc5 Release 1.25.8 (#1788)
• a2697e7 Optimize _encode_invalid_chars (#1787)
• d2a5a59 Move IPv6 test skips in server fixtures
• d44f0e5 Factorize test certificates serialization
• 84abc7f Generate IPV6 certificates using trustme
• 6a15b18 Run IPv6 Tornado server from fixture
• 4903840 Use trustme to generate IP_SAN cert
• 9971e27 Empty responses should have no lines.
• 62ef68e Use trustme to generate NO_SAN certs
• fd2666e Use fixture to configure NO_SAN test certs
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.