chore: Bump up to Go 1.19, minimum 1.18 (#4925)

4 files changed, 4 insertions, 4 deletions

diff --git a/modules/caddyhttp/reverseproxy/admin.go b/modules/caddyhttp/reverseproxy/admin.go
index 771fa10..f64d1ec 100644
--- a/modules/caddyhttp/reverseproxy/admin.go
+++ b/modules/caddyhttp/reverseproxy/admin.go
@@ -76,7 +76,7 @@ func (adminUpstreams) handleUpstreams(w http.ResponseWriter, r *http.Request) er
 
 	// Iterate over the upstream pool (needs to be fast)
 	var rangeErr error
-	hosts.Range(func(key, val interface{}) bool {
+	hosts.Range(func(key, val any) bool {
 		address, ok := key.(string)
 		if !ok {
 			rangeErr = caddy.APIError{
diff --git a/modules/caddyhttp/reverseproxy/healthchecks.go b/modules/caddyhttp/reverseproxy/healthchecks.go
index 317b283..eb98638 100644
--- a/modules/caddyhttp/reverseproxy/healthchecks.go
+++ b/modules/caddyhttp/reverseproxy/healthchecks.go
@@ -269,7 +269,7 @@ func (h *Handler) doActiveHealthCheck(dialInfo DialInfo, hostAddr string, upstre
 	// attach dialing information to this request
 	ctx := h.ctx.Context
 	ctx = context.WithValue(ctx, caddy.ReplacerCtxKey, caddy.NewReplacer())
-	ctx = context.WithValue(ctx, caddyhttp.VarsCtxKey, map[string]interface{}{
+	ctx = context.WithValue(ctx, caddyhttp.VarsCtxKey, map[string]any{
 		dialInfoVarKey: dialInfo,
 	})
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
diff --git a/modules/caddyhttp/reverseproxy/reverseproxy.go b/modules/caddyhttp/reverseproxy/reverseproxy.go
index 7061275..c800b39 100644
--- a/modules/caddyhttp/reverseproxy/reverseproxy.go
+++ b/modules/caddyhttp/reverseproxy/reverseproxy.go
@@ -1317,7 +1317,7 @@ func (brc bodyReadCloser) Close() error {
 
 // bufPool is used for buffering requests and responses.
 var bufPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		return new(bytes.Buffer)
 	},
 }
diff --git a/modules/caddyhttp/reverseproxy/streaming.go b/modules/caddyhttp/reverseproxy/streaming.go
index 6bd1af2..298ab58 100644
--- a/modules/caddyhttp/reverseproxy/streaming.go
+++ b/modules/caddyhttp/reverseproxy/streaming.go
@@ -279,7 +279,7 @@ func (c switchProtocolCopier) copyToBackend(errc chan<- error) {
 }
 
 var streamingBufPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		// The Pool's New function should generally only return pointer
 		// types, since a pointer can be put into the return interface
 		// value without an allocation