Bump eol img in makefile to alpine 3.6

Signed-off-by: Brian Chuo <[email protected]>

Makefile

@@ -18,7 +18,7 @@ REMOVER_IMG ?= ${REMOVER_REPO}:${REMOVER_TAG}
 COLLECTOR_REPO ?= ghcr.io/eraser-dev/collector
 COLLECTOR_IMG ?= ${COLLECTOR_REPO}:${COLLECTOR_TAG}
 VULNERABLE_IMG ?= docker.io/library/alpine:3.7.3
-EOL_IMG ?= docker.io/library/alpine:3.1
+EOL_IMG ?= docker.io/library/alpine:3.6
 BUSYBOX_BASE_IMG ?= busybox:1.36.0
 NON_VULNERABLE_IMG ?= ghcr.io/eraser-dev/non-vulnerable:latest
 E2E_TESTS ?= $(shell find ./test/e2e/tests/ -mindepth 1 -type d)