Bump key server (#936)

Author: sethvargo

go.mod

@@ -24,7 +24,7 @@ require (
 	github.com/gonum/internal v0.0.0-20181124074243-f884aa714029 // indirect
 	github.com/gonum/lapack v0.0.0-20181123203213-e4cdc5a0bff9 // indirect
 	github.com/gonum/matrix v0.0.0-20181209220409-c518dec07be9
-	github.com/google/exposure-notifications-server v0.14.1-0.20201029142042-d22c576d1701
+	github.com/google/exposure-notifications-server v0.15.0
 	github.com/google/go-cmp v0.5.2
 	github.com/gorilla/csrf v1.7.0
 	github.com/gorilla/handlers v1.5.1

go.sum

@@ -488,8 +488,8 @@ github.com/gonum/matrix v0.0.0-20181209220409-c518dec07be9/go.mod h1:0EXg4mc1CNP
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.0.0 h1:0udJVsspx3VBr5FwtLhQQtuAsVc79tTq0ocGIPAU6qo=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
-github.com/google/exposure-notifications-server v0.14.1-0.20201029142042-d22c576d1701 h1:kuyJFaSRGgveKzgH4xwld3j2TZfu8wFHK4uhZmazY1c=
-github.com/google/exposure-notifications-server v0.14.1-0.20201029142042-d22c576d1701/go.mod h1:oyS7traveoREo37z0irHi0zN304YjD9esDZ4eL3Jtqo=
+github.com/google/exposure-notifications-server v0.15.0 h1:y0yNjt3BPRdtxFEIgrVcnuJuJECLpi+E+7+utPlN+wM=
+github.com/google/exposure-notifications-server v0.15.0/go.mod h1:oyS7traveoREo37z0irHi0zN304YjD9esDZ4eL3Jtqo=
 github.com/google/flatbuffers v1.11.0/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=