fix(deps): update module google.golang.org/grpc to v1.48.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
google.golang.org/grpc	require	minor	v1.47.0 -> v1.48.0

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Release Notes

grpc/grpc-go

v1.48.0

Compare Source

Bug Fixes

• xds/priority: fix bug that could prevent higher priorities from receiving config updates (#​5417)
• RLS load balancer: don't propagate the status code returned on control plane RPCs to data plane RPCs (#​5400)

New Features

• stats: add support for multiple stats handlers in a single client or server (#​5347)
• gcp/observability: add experimental OpenCensus tracing/metrics support (#​5372)
• xds: enable aggregate and logical DNS clusters by default (#​5380)
• credentials/google (for xds): support xdstp C2P cluster names (#​5399)

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