Import error sdk/metric/aggregation

[maciejrozanski]

After trying to run example from:
https://github.com/GoogleCloudPlatform/opentelemetry-operations-go/tree/main/exporter/metric

go: finding module for package go.opentelemetry.io/otel/sdk/metric/aggregation
go: xxx imports
        github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric imports
        go.opentelemetry.io/otel/sdk/metric/aggregation: module go.opentelemetry.io/otel/sdk/metric@latest found (v0.41.0), but does not contain package go.opentelemetry.io/otel/sdk/metric/aggregation

[dashpole]

We just need to update to the latest version to fix this (#728). If you want to work around this, you can downgrade your sdk/metric package version in your go.mod to v0.41.0