Bump github.com/alecthomas/kong from 1.7.0 to 1.8.0 #10473

Job	Run time
Run integration tests (test-e2e)	20m 56s
Run Unit Tests (test-with-cover-pkg)	3m 49s
Run integration tests (test-integration-poller)	10m 6s
Build	2m 1s
Run Unit Tests (test-with-cover-tempodb)	17m 8s
Benchmark	9m 48s
Run integration tests (test-e2e-deployments)	13m 50s
Run Unit Tests (test-with-cover-tempodb-wal)	11m 22s
Build technical documentation	18s
Lint	3m 39s
Run Unit Tests (test-with-cover-others)	14m 54s
Check jsonnet & tempo-mixin	52s
Vendor check	1m 36s
	1h 50m 19s

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