Bump grpc from `eff8a88` to `c7ee0c1`

[dependabot[bot]]

Bumps grpc from eff8a88 to c7ee0c1.

Commits

• c7ee0c1 add test to the example app (#263)
• dd6cc87 Feat/timestamp example (#262)
• d172921 refactor: change application config methods (#258)
• f181e31 fix: rollback timeout opt handling (#256)
• ce73826 Adds support for grpc-web (#206)
• 0dda897 refactor: accept keywords for opts instead of maps (#255)
• 1e0598b fix: avoid overriding user config if possible (#236)
• da37494 chore: resolve some doc warnings (#250)
• 3f1a6b6 Allow to use iolists in GRPC.Message.to_data/2 (#195)
• a3e4445 chore: bump to 0.5.0 (#253)
• Additional commits viewable in compare view

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