improve the sorting rules of archives by using reverse year order (#3158)

<!--  Thanks for sending a pull request!  Here are some tips for you:
1. 如果这是你的第一次，请阅读我们的贡献指南：<https://github.com/halo-dev/halo/blob/master/CONTRIBUTING.md>。
1. If this is your first time, please read our contributor guidelines: <https://github.com/halo-dev/halo/blob/master/CONTRIBUTING.md>.
2. 请根据你解决问题的类型为 Pull Request 添加合适的标签。
2. Please label this pull request according to what type of issue you are addressing, especially if this is a release targeted pull request.
3. 请确保你已经添加并运行了适当的测试。
3. Ensure you have added or ran the appropriate tests for your PR.
-->

#### What type of PR is this?
/kind improvement
/area core
<!--
添加其中一个类别：
Add one of the following kinds:

/kind bug
/kind cleanup
/kind documentation
/kind feature
/kind improvement

适当添加其中一个或多个类别（可选）：
Optionally add one or more of the following kinds if applicable:

/kind api-change
/kind deprecation
/kind failing-test
/kind flake
/kind regression
-->

#### What this PR does / why we need it:
Display archives in reverse chronological order.
#### Which issue(s) this PR fixes:

<!--
PR 合并时自动关闭 issue。
Automatically closes linked issue when PR is merged.

用法：`Fixes #<issue 号>`，或者 `Fixes (粘贴 issue 完整链接)`
Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
-->
Fixes https://github.com/halo-dev/halo/issues/3157

#### Special notes for your reviewer:
改进前：
![image](https://user-images.githubusercontent.com/28662535/212591149-68683249-76a4-4cba-8b02-9a58901709ec.png)

改进后：
![image](https://user-images.githubusercontent.com/28662535/212591100-2c155cb7-832f-4c19-96bd-b783810138ce.png)

#### Does this PR introduce a user-facing change?

<!--
如果当前 Pull Request 的修改不会造成用户侧的任何变更，在 `release-note` 代码块儿中填写 `NONE`。
否则请填写用户侧能够理解的 Release Note。如果当前 Pull Request 包含破坏性更新（Break Change），
Release Note 需要以 `action required` 开头。
If no, just write "NONE" in the release-note block below.
If yes, a release note is required:
Enter your extended release note in the block below. If the PR requires additional action from users switching to the new release, include the string "action required".
-->

```release-note
归档以年份降序排序
```

src/main/java/run/halo/app/theme/finders/impl/PostFinderImpl.java

@@ -276,7 +276,9 @@ public class PostFinderImpl implements PostFinder {
                             .year(String.valueOf(key))
                             .months(monthArchives)
                             .build();
-                    }).toList();
+                    })
+                    .sorted(Comparator.comparing(PostArchiveVo::getYear).reversed())
+                    .toList();
                 return new ListResult<>(list.getPage(), list.getSize(), list.getTotal(),
                     postArchives);
             })