refactor: upgrade lints and fix infos warnings

lib/src/event.dart

@@ -27,7 +27,7 @@ class Event {
   /// unix timestamp in seconds
   late int createdAt;
 
-  /// -  0: set_metadata: the content is set to a stringified JSON object {name: <username>, about: <string>, picture: <url, string>} describing the user who created the event. A relay may delete past set_metadata events once it gets a new one for the same pubkey.
+  /// -  0: set_metadata: the content is set to a stringified JSON object {name: username, about: string, picture: url} describing the user who created the event. A relay may delete past set_metadata events once it gets a new one for the same pubkey.
   /// -  1: text_note: the content is set to the text content of a note (anything the user wants to say). Non-plaintext notes should instead use kind 1000-10000 as described in NIP-16.
   /// -  2: recommend_server: the content is set to the URL (e.g., wss://somerelay.com) of a relay the event creator wants to recommend to its followers.
   late int kind;
@@ -275,11 +275,11 @@ class Event {
   ///
   ///[
   ///  0,
-  ///  <pubkey, as a (lowercase) hex string>,
-  ///  <created_at, as a number>,
-  ///  <kind, as a number>,
-  ///  <tags, as an array of arrays of non-null strings>,
-  ///  <content, as a string>
+  ///  `pubkey`, as a (lowercase) hex string,
+  ///  `created_at`, as a number,
+  ///  `kind`, as a number,
+  ///  `tags`, as an array of arrays of non-null strings,
+  ///  `content`, as a strin>
   ///]
   String getEventId() {
     // Included for minimum breaking changes

lib/src/nips/nip_004.dart

@@ -7,7 +7,7 @@ import 'package:nostr/src/utils.dart';
 ///
 /// content MUST be equal to the base64-encoded, aes-256-cbc encrypted string of anything a user wants to write, encrypted using a shared nip4cipher generated by combining the recipient's public-key with the sender's private-key;
 /// this appended by the base64-encoded initialization vector as if it was a querystring parameter named "iv".
-/// The format is the following: "content": "<encrypted_text>?iv=<initialization_vector>".
+/// The format is the following: "content": "`encrypted_text`?iv=`initialization_vector`".
 ///
 /// tags MUST contain an entry identifying the receiver of the message (such that relays may naturally forward this event to them), in the form ["p", "pubkey, as a hex string"].
 ///

lib/src/nips/nip_010.dart

@@ -1,7 +1,6 @@
-///This NIP describes how to use "e" and "p" tags in text events,
-///especially those that are replies to other text events.
-///It helps clients thread the replies into a tree rooted at the original event.
-
+/// This NIP describes how to use "e" and "p" tags in text events,
+/// especially those that are replies to other text events.
+/// It helps clients thread the replies into a tree rooted at the original event.
 class Nip10 {
   ///{
   ///     "tags": [

pubspec.yaml

@@ -7,7 +7,7 @@ environment:
   sdk: '>=2.18.5 <4.0.0'
 
 dev_dependencies:
-  lints: ^2.0.0
+  lints: ^5.1.1
   test: ^1.16.0
 dependencies:
   bip340: ^0.2.0