Flaky TestFailover_Get_BackgroundUpdateMaxExpiration

[vearutop]

--- FAIL: TestFailover_Get_BackgroundUpdateMaxExpiration (0.03s)
    --- FAIL: TestFailover_Get_BackgroundUpdateMaxExpiration/*cache.ShardedMap (0.01s)
        failover_test.go:283: 
            	Error Trace:	/home/runner/work/cache/cache/failover_test.go:283
            	Error:      	Not equal: 
            	            	expected: "second value"
            	            	actual  : "first value"
            	            	
            	            	Diff:
            	            	--- Expected
            	            	+++ Actual
            	            	@@ -1 +1 @@
            	            	-second value
            	            	+first value
            	Test:       	TestFailover_Get_BackgroundUpdateMaxExpiration/*cache.ShardedMap
        failover_test.go:284: 
            	Error Trace:	/home/runner/work/cache/cache/failover_test.go:284
            	Error:      	Not equal: 
            	            	expected: 2
            	            	actual  : 1
            	Test:       	TestFailover_Get_BackgroundUpdateMaxExpiration/*cache.ShardedMap
        failover_test.go:291: 
            	Error Trace:	/home/runner/work/cache/cache/failover_test.go:291
            	            				/home/runner/work/cache/cache/failover.go:336
            	            				/home/runner/work/cache/cache/failover.go:226
            	            				/home/runner/work/cache/cache/failover_test.go:289
            	Error:      	should not be here
            	Test:       	TestFailover_Get_BackgroundUpdateMaxExpiration/*cache.ShardedMap
        failover_test.go:296: 
            	Error Trace:	/home/runner/work/cache/cache/failover_test.go:296
            	Error:      	Not equal: 
            	            	expected: "second value"
            	            	actual  : "not relevant"
            	            	
            	            	Diff:
            	            	--- Expected
            	            	+++ Actual
            	            	@@ -1 +1 @@
            	            	-second value
            	            	+not relevant
            	Test:       	TestFailover_Get_BackgroundUpdateMaxExpiration/*cache.ShardedMap
FAIL

https://github.com/bool64/cache/actions/runs/7324991988/job/19949063574?pr=40