Bump urllib3 from 1.24.3 to 1.25.3

[dependabot-preview]

Bumps urllib3 from 1.24.3 to 1.25.3.

Release notes

Sourced from urllib3's releases.

1.25.2

No release notes provided.

1.25.1

• Add support for Google's Brotli package. (Pull #1572, Pull #1579)
• Upgrade bundled rfc3986 to v1.3.1 (Pull #1578)

1.25

Release: 1.25

Changelog

Sourced from urllib3's changelog.

1.25.3 (2019-05-23)

• Change HTTPSConnection to load system CA certificates when ca_certs, ca_cert_dir, and ssl_context are unspecified. (Pull #1608, Issue #1603)
• Upgrade bundled rfc3986 to v1.3.2. (Pull #1609, Issue #1605)

1.25.2 (2019-04-28)

• Change is_ipaddress to not detect IPvFuture addresses. (Pull #1583)
• Change parse_url to percent-encode invalid characters within the path, query, and target components. (Pull #1586)

1.25.1 (2019-04-24)

• Add support for Google's Brotli package. (Pull #1572, Pull #1579)
• Upgrade bundled rfc3986 to v1.3.1 (Pull #1578)

1.25 (2019-04-22)

• Require and validate certificates by default when using HTTPS (Pull #1507)
• Upgraded urllib3.utils.parse_url() to be RFC 3986 compliant. (Pull #1487)
• Added support for key_password for HTTPSConnectionPool to use encrypted key_file without creating your own SSLContext object. (Pull #1489)
• Add TLSv1.3 support to CPython, pyOpenSSL, and SecureTransport SSLContext implementations. (Pull #1496)
• Switched the default multipart header encoder from RFC 2231 to HTML 5 working draft. (Issue #303, PR #1492)
• Fixed issue where OpenSSL would block if an encrypted client private key was given and no password was given. Instead an SSLError is raised. (Pull #1489)
• Added support for Brotli content encoding. It is enabled automatically if brotlipy package is installed which can be requested with urllib3[brotli] extra. (Pull #1532)
• Drop ciphers using DSS key exchange from default TLS cipher suites. Improve default ciphers when using SecureTransport. (Pull #1496)
• Implemented a more efficient HTTPResponse.__iter__() method. (Issue #1483)

Commits

• 337992a Release v1.25.3 (#1616)
• 42bacbc Load system CA certificates by default on empty HTTPSConnection (#1608)
• 0a97553 Create .github/FUNDING.yml (#1615)
• cdbceed Remove extra words in the contributing docs (#1613)
• 3773cf1 Upgrade rfc3986 to 1.3.2 (#1609)
• 027fc8e Document 1.24.3 patch release (#1606)
• 7d813bc Merge pull request #1598 from urllib3/haikuginger/remove-akamai
• 78dbac0 Fix names; remove Akamai as ongoing sponsor
• 7c8422f Update coverage for nox (#1596)
• 49eea80 Release 1.25.2 (#1588)
• Additional commits viewable in compare view

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[dependabot-preview]

Looks like urllib3 is up-to-date now, so this is no longer needed.