Update puffin_viewer requirement from 0.6 to 0.8

[dependabot[bot]]

Updates the requirements on puffin_viewer to permit the latest version.

Changelog

Sourced from puffin_viewer's changelog.

0.8.0 - 2021-09-06

• Switch from lz4 to zstd compression for 50% file size and bandwidth reduction.

0.7.0 - 2021-08-23

• Speed up GlobalProfiler::new_frame.
• New serialization feature flag enables exporting and importing .puffin files. This replaces the old with_serde feature flag.
• Add GlobalProfiler::add_sink for installing callbacks that are called each frame.

0.6.0 - 2021-07-05

• Handle Windows, which uses backslash (\) as path separator.

0.5.2

• Add opt-in serde support.

0.5.1

• Remove stderr warning about empty frames.

0.5.0

• GlobalProfiler now store recent history and the slowest frames.

Commits

• 122e1e7 Release puffin_viewer 0.8.0 - file as positional arg
• 367e33b Release puffin_egui 0.10.0 - update to egui 0.15.0
• 56b6292 Release puffin-imgui 0.13.2 - Add ProfilerUi::global_frame_view
• 7f9151e Release puffin_http 0.7.1 - send outstanding events on shutdown
• 1101b7a improve docstring
• 430ea12 puffin_viewer: Change --file option to instead be a positional argument
• a60e3bd puffin-imgui and puffin-egui: add accessor for the GlobalFrameView
• 7af7408 Update to egui/eframe 0.15.0
• 4de62b7 puffin_http: Send all outstanding frames on shutdown.
• 87c8bd0 puffin-imgui 0.13.1, puffin_egui 0.9.1, puffin_viewer 0.7.1
• Additional commits viewable in compare view

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