[DRE-maint] Bug#749193: apt-listbugs: Reemergence of ruby encoding troubles

[Andrey Rakhmatullin]

Another case, #1122404 (```
dynare: FTBFS: Error: ‘b’ at (1) has the CONTIGUOUS attribute but is not an array pointer or an assumed-shape or assumed-rank array
```)

Note that there are, as my Konsole said when I pasted this from the 
browser, control symbols there, they are visible in my vim in the line 
above right now but may not be visible for you: ```Error: â<80><98>bâ<80><99>```.

`apt-listbugs list gcc-15` fails with "incompatible character encodings: 
ASCII-8BIT and UTF-8" but `LANG=C apt-listbugs list gcc-15` exits after 
printing the first â:

```
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
serious bugs of gcc-15 (-> ) <Forwarded>
  b1 - #1119850 - netpbm-free: FTBFS on arm* (testsuite error) with gcc-15
serious bugs of gcc-15 (-> ) <Resolved in some Version>
  b2 - #1122404 - dynare: FTBFS: Error: â%                                                                                                                                                                                                  
```

(the final % is from zsh, showing that the newline wasn't printed before 
exiting)

-- 
WBR, wRAR
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