Bump flask from 1.0.2 to 1.0.3

[dependabot-preview]

Bumps flask from 1.0.2 to 1.0.3.

Changelog

Sourced from flask's changelog.

Version 1.0.3

Unreleased

• send_file encodes filenames as ASCII instead of Latin-1 (ISO-8859-1). This fixes compatibility with Gunicorn, which is stricter about header encodings than PEP 3333. (#2766)
• Allow custom CLIs using FlaskGroup to set the debug flag without it always being overwritten based on environment variables. (#2765)
• flask --version outputs Werkzeug's version and simplifies the Python version. (#2825)
• send_file handles an attachment_filename that is a native Python 2 string (bytes) with UTF-8 coded bytes. (#2933)
• A catch-all error handler registered for HTTPException will not handle RoutingException, which is used internally during routing. This fixes the unexpected behavior that had been introduced in 1.0. (#2986)

Commits

• 99660cc release version 1.0.3
• 3dc84ec Merge pull request #3206 from pallets/test-client-json
• a4f0f19 don't push app context for test client json
• f2c8540 Merge pull request #3169 from DamianSkrzypczak/3168-improve-warning-about-dev...
• e2f4b53 Fix dev-server warning message readability (#3168)
• ab3f922 Merge pull request #3154 from brunoais/more-explicit-session-transaction
• 6142aa6 More explicit explanation: session testing
• 55801b5 Merge pull request #3166 from mekarpeles/refactor/unused-url_join
• ac78da0 removed unused reference to url_join
• 814a7ea Merge pull request #3204 from pallets/azure
• Additional commits viewable in compare view

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