fix(chore): race condition and panic in singleflight process #1350

Job	Run time
Check that Souin build as caddy module	6m 32s
Check that Souin build as middleware / Check that Souin build as Chi middleware	2m 52s
Check that Souin build as middleware / Check that Souin build as Beego middleware	2m 25s
Check that Souin build as middleware / Check that Souin build as Dotweb middleware	2m 24s
Check that Souin build as middleware / Check that Souin build as Echo middleware	2m 33s
Check that Souin build as middleware / Check that Souin build as Fiber middleware	2m 34s
Check that Souin build as middleware / Check that Souin build as Gin middleware	2m 37s
Check that Souin build as middleware / Check that Souin build as Goa middleware	2m 48s
Check that Souin build as middleware / Check that Souin build as Hertz middleware	2m 16s
Check that Souin build as middleware / Check that Souin build as Kratos middleware	2m 49s
Check that Souin build as middleware / Check that Souin build as Roadrunner middleware	3m 45s
Check that Souin build as middleware / Check that Souin build as Go-zero middleware	3m 58s
Check that Souin build as middleware / Check that Souin build as Souin middleware	2m 27s
Check that Souin build as middleware / Check that Souin build as Traefik middleware	2m 6s
Check that Souin build as middleware / Check that Souin build as Tyk middleware	3m 46s
Check that Souin build as middleware / Check that Souin build as Webgo middleware	2m 24s
	48m 16s

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