collector -v is UNSET in 0.9.0

[harveyrendell]

Describe the bug
collector -v is returning unset in collector release 0.9.0

Steps to reproduce

URL=$(aws lambda get-layer-version-by-arn --arn arn:aws:lambda:us-west-2:184161586896:layer:opentelemetry-collector-arm64-0_9_0:1 --query Content.Location --output text)
curl $URL -o layer.zip
unzip layer.zip
extensions/collector -v

What did you expect to see?
The version of the opentelemetry collector included in the layer. In this case v0.105.0

What did you see instead?
UNSET

What version of collector/language SDK version did you use?
0.9.0

What language layer did you use?
basic collector extension layer

Additional context
I believe this is caused by this change: https://github.com/open-telemetry/opentelemetry-lambda/pull/1401/files

[harveyrendell]

Note that this issue is not present when using the 0.8.0 layer