Bump prompt-toolkit from 3.0.26 to 3.0.28

[dependabot]

Bumps prompt-toolkit from 3.0.26 to 3.0.28.

Changelog

Sourced from prompt-toolkit's changelog.

3.0.28: 2022-02-11

New features:

• Support format specifiers for HTML and ANSI formatted text.
• Accept defaults for checkbox and radio list, and their corresponding dialogs.

Fixes:

• Fix resetting of cursor shape after the application terminates.

3.0.27: 2022-02-07

New features:

• Support for cursor shapes. The cursor shape for prompts/applications can now be configured, either as a fixed cursor shape, or in case of Vi input mode, according to the current input mode.
• Handle "cursor forward" command in ANSI formatted text. This makes it possible to render many kinds of generated ANSI art.
• Accept align attribute in Label widget.
• Added PlainTextOutput: an output implementation that doesn't render any ANSI escape sequences. This will be used by default when redirecting stdout to a file.
• Added create_app_session_from_tty: a context manager that enforces input/output to go to the current TTY, even if stdin/stdout are attached to pipes.
• Added to_plain_text utility for converting formatted text into plain text.

Fixes:

• Don't automatically use sys.stderr for output when sys.stdout is not a TTY, but sys.stderr is. The previous behavior was confusing, especially when rendering formatted text to the output, and we expect it to follow redirection.

Commits

• f3088dc Release 3.0.28
• a3b450c Add option for passing default values to checkbox/radiolist dialogs.
• 380644a Upgrade to 3.6 syntax using pyupgrade.
• 0980bc3 merge html formatting updates into ansi (#1568)
• e78e652 HTML.format specifiers (#1566)
• 700ae9e Fix: reset cursorshape correctly when application terminates.
• 6ac867a Release 3.0.27
• 96ec6fb Removed unused imports.
• b4d728e Added support for cursor shapes.
• 4a66820 Added to_plain_text utility. A function to turn formatted text into a string.
• Additional commits viewable in compare view

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