fix typo s/CGM/GCM/i

only user visible change is in the error message

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

pbs-config/src/key_config.rs

@@ -67,7 +67,7 @@ impl KeyDerivationConfig {
 /// Encryption Key Configuration
 ///
 /// We use this struct to store secret keys. When used with a key
-/// derivation function, the key data is encrypted (AES-CGM), and you
+/// derivation function, the key data is encrypted (AES-GCM), and you
 /// need the password to restore the plain key.
 #[derive(Deserialize, Serialize, Clone, Debug)]
 pub struct KeyConfig {