build(deps): bump libmozdata from 0.2.7 to 0.2.8 in /bot

[dependabot[bot]]

Bumps libmozdata from 0.2.7 to 0.2.8.

Release notes

Sourced from libmozdata's releases.

v0.2.8

• Add user agent in requests headers (#249)
• Add pytz to requirements (#250)
• Add a function to get option from config with assert not None (#251)

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Released with mozilla/task-boot

Commits

• 8c64adb Version 0.2.8
• bc22303 Add a function to get option from config with assert not None (#251)
• ea1b03e Add pytz to requirements (#250)
• 52b0fc6 Add user agent in requests headers (#249)
• See full diff in compare view

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