[build][202505] Update apt source list to azure mirror in docker dash-engine

[yijingyan2]

Why I did it

cherry-pick #22793 to fix docker dash-engine debian connection issue in vs build

Work item tracking

• Microsoft ADO (number only):

How I did it

How to verify it

Which release branch to backport (provide reason below if selected)

• 202305
• 202311
• 202405
• 202411
• 202505
• 202511

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[yijingyan2]

why needed for 202505 branch:
The image builds in 202505 sometimes fail due to network access to archive.ubuntu.com:80 issue.

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal/InRelease  Connection failed [IP: 185.125.190.81 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease  Connection failed [IP: 185.125.190.82 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-backports/InRelease  Connection failed [IP: 91.189.91.81 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/focal-security/InRelease  Connection failed [IP: 91.189.91.81 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.

With this change, we can use our debian mirror for a more stable connection.