[Bug 1955116] [NEW] mk-sbuild create error due to bullseye security move

[Nick Brown]

Public bug reported:

Probably very similar to 1916633 reported and fixed in pbuilder-dist.

while using `mk-sbuild --name foobar bullseye`

```
E: The repository 'http://security.debian.org bullseye/updates Release' does not have a Release file.
```

Bullseye changed the format of security suite:
https://www.debian.org/releases/bullseye/amd64/release-notes/ch-
information.en.html#security-archive

and should look like:

```
deb https://deb.debian.org/debian-security bullseye-security main contrib
```

while mk-sbuild is still generating the older format as found in buster
and earlier:

```
deb http://security.debian.org/ bullseye/updates main non-free contrib
```

at this bit of the code:
https://git.launchpad.net/ubuntu/+source/ubuntu-dev-tools/tree/mk-
sbuild#n661

** Affects: ubuntu-dev-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ubuntu-dev-tools (Debian)
     Importance: Unknown
         Status: Unknown

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https://bugs.launchpad.net/bugs/1955116

Title:
  mk-sbuild create error due to bullseye security move

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