Fix memcache host for local tempo setup #9058

Job	Run time
Run Unit Tests (test-with-cover-pkg)	3m 4s
Run Unit Tests (test-with-cover-tempodb)	15m 57s
Run Unit Tests (test-with-cover-tempodb-wal)	10m 45s
Benchmark	9m 27s
Run Unit Tests (test-with-cover-others)	12m 14s
Build	1m 43s
Run integration tests (test-e2e)	20m 2s
Lint	2m 59s
Run integration tests (test-integration-poller)	9m 24s
Run integration tests (test-e2e-deployments)	13m 17s
Run integration tests (test-e2e-serverless)	6m 52s
Build technical documentation	18s
Vendor check	1m 21s
Check jsonnet & tempo-mixin	46s
	1h 48m 9s

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