libvips: download ældre versioner

Release 8.18.7
- Update dependencies to latest where possible.
PDBs can be found here:
https://libvips-packaging.s3.amazonaws.com/pdb/index.html

Release 8.18.6
- Update dependencies to latest where possible.
PDBs can be found here:
https://libvips-packaging.s3.amazonaws.com/pdb/index.html

Release 8.18.5
- Update dependencies to latest where possible.
PDBs can be found here:
https://libvips-packaging.s3.amazonaws.com/pdb/index.html

Release 8.18.4
- Update dependencies to latest where possible.
PDBs can be found here:
https://libvips-packaging.s3.amazonaws.com/pdb/index.html

Release 8.18.2
- Update dependencies to latest where possible.
Note
The w32 and w64 packages have been renamed to x86 and x64, respectively (e6b6e51).
PDBs can be found here:
https://libvips-packaging.s3.amazonaws.com/pdb/index.html

Release 8.18.1
- Update dependencies to latest where possible.
Note
In the next release, the w32 and w64 packages will be renamed to x86 and x64, respectively (e6b6e51).
PDBs can be found here:
https://libvips-packaging.s3.amazonaws.com/pdb/index.html

Release 8.18.0
- Update dependencies to latest where possible.
- Add libultrahdr to 'web' group dependencies for Ultra HDR support (#88).
- Add LibRaw to 'all' group dependencies for RAW digicam input support (#77).
- Add zstd to 'all' group dependencies for Zstd-compressed TIFF support (#80).
- Drop spng from dependencies (#84).
- Distribute missing vips-dev-arm64-all-*.zip and vips-dev-arm64-web-*.zip packages.
PDBs can be found here:
https://libvips-packaging.s3.amazonaws.com/pdb/index.html

Release 8.17.2
- Update dependencies to latest where possible.
PDBs can be found here:
https://libvips-packaging.s3.amazonaws.com/pdb/index.html