dub: autopkgtest regression and gcc-11 FTBFS

Imported from Debian bug http://bugs.debian.org/981229:

Source: dub
Version: 1.24.0-1
Severity: serious
X-Debbugs-Cc: <email address hidden>

| autopkgtest [03:11:10]: test run: [-----------------------
| Package dub not found for registry at https://code.dlang.org/ (fallbacks registry at https://codemirror.dlang.org/, registry at https://dub.bytecraft.nl/, registry at https://code-mirror.dlang.io/): Failed to download https://code.dlang.org/api/packages/infos?packages=%5B%22dub%22%5D&include_dependencies=true&minimize=true
| Getting a release version failed: No package dub was found matching the dependency >=0.0.0
| Retry with ~master...
| Package dub not found for registry at https://code.dlang.org/ (fallbacks registry at https://codemirror.dlang.org/, registry at https://dub.bytecraft.nl/, registry at https://code-mirror.dlang.io/): Failed to download https://code.dlang.org/api/packages/infos?packages=%5B%22dub%22%5D&include_dependencies=true&minimize=true
| No package dub was found matching the dependency ~master
| autopkgtest [03:11:10]: test run: -----------------------]
| autopkgtest [03:11:11]: test run: - - - - - - - - - - results - - - - - - - - - -
| run FAIL non-zero exit status 2

See
https://ci.debian.net/data/autopkgtest/testing/amd64/d/dub/10040021/log.gz

Cheers
--
Sebastian Ramacher