Cleanup dependencies

[myleshorton]

Update to various latest versions, primarily of our own repos, both to keep things up to date and to resolve issues importing http-proxy-lantern particularly from flashlight:

github.com/getlantern/flashlight/integrationtest imports
	github.com/getlantern/http-proxy-lantern/v2 imports
	github.com/getlantern/http-proxy-lantern/v2/otel imports
	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp imports
	go.opentelemetry.io/otel/exporters/otlp/internal: module go.opentelemetry.io/otel/exporters/otlp@latest found (v0.20.1), but does not contain package go.opentelemetry.io/otel/exporters/otlp/internal
github.com/getlantern/flashlight/integrationtest imports
	github.com/getlantern/http-proxy-lantern/v2 imports
	github.com/getlantern/http-proxy-lantern/v2/otel imports
	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp imports
	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/oconf imports
	go.opentelemetry.io/otel/exporters/otlp/internal/envconfig: module go.opentelemetry.io/otel/exporters/otlp@latest found (v0.20.1), but does not contain package go.opentelemetry.io/otel/exporters/otlp/internal/envconfig

[myleshorton]

Bringing this in...

[myleshorton]

For posterity, the reason the dependency tree was a little screwy was because go mod tidy was looking for the latest tag, which was on an older version. The "fix" was just to tag the latest. tbc this is running a fresh go mod init and go mod tidy from flashlight, which, if your dependency tree is clean, should result in a working copy. In this case, it grabbed an old http-proxy-lantern, resulting in the above error.