build(deps): bump @grpc/proto-loader from 0.7.15 to 0.8.0

[dependabot]

Bumps @grpc/proto-loader from 0.7.15 to 0.8.0.

Release notes

Sourced from @​grpc/proto-loader's releases.

@​grpc/proto-loader 0.8.0

• Add serialize and deserialize functions to Message definition objects. See grpc/proposal#503 for more details. (#2970)

Commits

• 31c8b71 grpc-js-xds: Regenerate interop and test files in prepare script
• 0df98ce grpc-js: Regenerate test files in prepare script
• 30e7287 Update generated proto files with type changes
• 549d858 proto-loader: Output functions to serialize and deserialize messages
• 31b431a Merge pull request #2973 from murgatroid99/proto_editions_update
• 5670eb2 Update generated proto files with editions change
• 179dbfa Merge pull request #2969 from murgatroid99/debugging_example
• d22becc Add debugging example
• 9877359 Merge pull request #2966 from murgatroid99/load_balancing_example
• 972bb23 Add load balancing example
• Additional commits viewable in compare view

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