fix: resolve etherscan api url string (#5217)

Author: DaniPopes

Diff for: config/src/etherscan.rs

@@ -163,7 +163,12 @@ impl EtherscanConfig {
         self,
         alias: Option<&str>,
     ) -> Result<ResolvedEtherscanConfig, EtherscanConfigError> {
-        let EtherscanConfig { chain, url, key } = self;
+        let EtherscanConfig { chain, mut url, key } = self;
+
+        if let Some(url) = &mut url {
+            *url = interpolate(url)?;
+        }
+
         let (chain, alias) = match (chain, alias) {
             // fill one with the other
             (Some(chain), None) => (Some(chain), Some(chain.to_string())),

Diff for: config/src/lib.rs

@@ -2428,7 +2428,7 @@ impl BasicConfig {
             "\
 [profile.{}]
 {s}
-# See more config options https://github.com/foundry-rs/foundry/tree/master/config",
+# See more config options https://github.com/foundry-rs/foundry/tree/master/config\n",
             self.profile
         ))
     }