Upgrade maxminddb to latest version.

Cargo.lock

@@ -1007,6 +1007,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "ipnetwork"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4088d739b183546b239688ddbc79891831df421773df95e236daf7867866d355"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.8"
@@ -1095,11 +1104,13 @@ checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
 
 [[package]]
 name = "maxminddb"
-version = "0.17.3"
+version = "0.23.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d13fa57adcc4f3aca91e511b3cdaa58ed8cbcbf97f20e342a11218c76e127f51"
+checksum = "fe2ba61113f9f7a9f0e87c519682d39c43a6f3f79c2cc42c3ba3dda83b1fa334"
 dependencies = [
+ "ipnetwork",
  "log",
+ "memchr",
  "serde",
 ]
 

Cargo.toml

@@ -16,7 +16,7 @@ cadence = "^0.29.0"
 envy = "^0.4.0"
 futures = "^0.3"
 lazy_static = "^1.2.0"
-maxminddb = "^0.17"
+maxminddb = "^0.23.0"
 regex = "^1.1.0"
 serde = "^1.0.80"
 serde_derive = "^1.0.80"

src/endpoints/classify.rs

@@ -77,7 +77,7 @@ mod tests {
         assert_eq!(*value.get("country").unwrap(), Value::Null);
 
         classification.country = Some(geoip2::Country {
-            country: Some(geoip2::model::Country {
+            country: Some(geoip2::country::Country {
                 geoname_id: None,
                 iso_code: Some("US"),
                 names: None,