Run go mod tidy

go.mod

 module git.autistici.org/id/auth-server-http-proxy
 
-go 1.18
+go 1.15
 
 require git.autistici.org/id/auth v0.0.0-20220205154055-722a4f1509a9
-
-require (
-	git.autistici.org/id/usermetadb v0.0.0-20210507085300-ad16aa223703 // indirect
-	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cenkalti/backoff/v4 v4.1.2 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
-	github.com/cloudflare/cfssl v0.0.0-20190726000631-633726f6bcb7 // indirect
-	github.com/duo-labs/webauthn v0.0.0-20220122034320-81aea484c951 // indirect
-	github.com/fxamacker/cbor/v2 v2.4.0 // indirect
-	github.com/golang-jwt/jwt/v4 v4.1.0 // indirect
-	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/google/certificate-transparency-go v1.0.21 // indirect
-	github.com/google/uuid v1.3.0 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
-	github.com/mitchellh/mapstructure v1.1.2 // indirect
-	github.com/prometheus/client_golang v1.12.1 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/prometheus/common v0.32.1 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
-	github.com/theckman/go-flock v0.8.1 // indirect
-	github.com/x448/float16 v0.8.4 // indirect
-	go.opencensus.io v0.23.0 // indirect
-	golang.org/x/crypto v0.0.0-20220131195533-30dcbda58838 // indirect
-	golang.org/x/sys v0.0.0-20220114195835-da31bd327af9 // indirect
-	google.golang.org/protobuf v1.27.1 // indirect
-)