fix: Remove unnecessary PEM files

[myk1343]

Remove unnecessary PEM files

Log: Remove unnecessary PEM files

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 文件 webExtensions.pem 被删除，需要确认是否有其他代码或配置依赖于此文件。
• 检查是否有相应的文档或注释来解释为什么需要删除此文件，以及删除文件后可能影响的功能。

是否建议立即修改:

• 是，需要确保删除文件不会导致系统功能不完整或出现不可预见的问题。如果有其他代码或配置依赖于此文件，应该先进行必要的更新以避免潜在的错误。同时，应该提供充分的文档和注释来解释文件删除的原因和影响。

[rb-union]

[是否满足兼容性要求] Y
[是否满足commit提交规范] Y
[是否满足编码规范] Y
[Review结论] Pass
[Fail原因] N/A

[jeffshuai]

[是否满足兼容性要求] Y
[是否满足commit提交规范] Y
[是否满足编码规范] Y
[Review结论] Pass
[Fail原因] N/A

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: myk1343, pengfeixx

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[myk1343]

/merge