fix: use go 1.19 to asure compatibilty with older OS

[sigilioso]

1.20 compiled binary doesn't work on OS with glic versions different from 2.32. Example in ubuntu focal (20.04):

/var/db/newrelic-infra/newrelic-integrations/bin/nri-oracledb -show_version
/var/db/newrelic-infra/newrelic-integrations/bin/nri-oracledb: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /var/db/newrelic-infra/newrelic-integrations/bin/nri-oracledb)

Additional context:

• Failing pre-release workflow: https://github.com/newrelic/nri-oracledb/actions/runs/5797323168/job/15712679934#step:11:1122
• cmd/go: cgo-enabled binary built with Ubuntu 22.04 is incompatible with Ubuntu 20.04 golang/go#57328
• /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found golang/go#58550

[marcsanmi]

👍

[AXDOOMER]

You could just have used bullseye instead of bookworm and kept using Go 1.21

[sigilioso]

Thanks for bringing it up. It was to buster in #142 and we'll keep it in mind when updating to Go 1.21.