[gomod] Bump go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc from 0.44.0 to 0.45.0 in /backend

[gomod] Bump go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc from 0.44.0 to 0.45.0 in /backend #663