Replace last use of anyhow with Box<dyn Error>.

We don't care about the error kind here, we just need to pass it to the
caller and print. anyhow seems a bit too heavy for the task.

While we're at it, remove unused futures-channel.

Author: bavshin-f5

Cargo.lock

@@ -10,11 +10,9 @@ rust-version = "1.81.0"
 crate-type = ["cdylib"]
 
 [dependencies]
-anyhow = "1.0.98"
 base64 = "0.22.1"
 bytes = "1.10.1"
 constcat = "0.6.1"
-futures-channel = "0.3.31"
 http = "1.3.1"
 http-body = "1.0.1"
 http-body-util = "0.1.3"

Cargo.toml

@@ -231,7 +231,7 @@ async fn ngx_http_acme_update_certificates(amcf: &AcmeMainConfig) -> Time {
 async fn ngx_http_acme_update_certificates_for_issuer(
     amcf: &AcmeMainConfig,
     issuer: &conf::issuer::Issuer,
-) -> anyhow::Result<Time> {
+) -> Result<Time, ngx::allocator::Box<dyn core::error::Error>> {
     let log = ngx_cycle_log();
     let http = NgxHttpClient::new(
         log,