* upgrade Go to 1.20.5

* ignore known issue with go tool cover

* capture cover output and check it for errors

* debug

* wip

* move ragel files to root directory

the //line directives used to point to the original "ragel" files were creating problems for the coverage tool. They were being reported without the 'parser/' directory. Causing the go tool cover to look for the wrong files and therefore failing.
Moving it all to the root directory fixes the problem.

* upgrade to go1.20.6

* .

* Revert "move ragel files to root directory"

This reverts commit 2b6a159.

* remove debug

* disable //line directives

* goimport

(cherry picked from commit a278734)

# Conflicts:
#	.go-version
#	.golangci.yml
#	Vagrantfile
#	auditbeat/Dockerfile
#	dev-tools/kubernetes/filebeat/Dockerfile.debug
#	dev-tools/kubernetes/heartbeat/Dockerfile.debug
#	dev-tools/kubernetes/metricbeat/Dockerfile.debug
#	dev-tools/mage/gotest.go
#	filebeat/input/syslog/rfc5424_parser.go
#	heartbeat/Dockerfile
#	libbeat/docs/version.asciidoc
#	libbeat/reader/syslog/rfc3164_test.go
#	libbeat/reader/syslog/rfc5424_test.go
#	metricbeat/Dockerfile
#	metricbeat/module/http/_meta/Dockerfile
#	metricbeat/module/nats/_meta/Dockerfile
#	packetbeat/Dockerfile
#	x-pack/functionbeat/Dockerfile
#	x-pack/metricbeat/module/stan/_meta/Dockerfile