Libdigidocpp: download ældre versioner

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- Fix unicode XML parsing (#763)
Full Changelog: https://github.com/open-eid/libdigidocpp/compare/v4.5.0...v4.5.1

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- Add Container::extendContainerValidity for adding archive timestamps to eligible ASiC-E and ASiC-S/TST containers, or wrapping a container in timestamped ASiC-S when in-place extension is unavailable
(#658)
- Update libraries and platform support
(#722, #726, #749)
- Improve signature and container compatibility
(#615, #728, #729, #730, #735, #751, #752, #754, #756)
- Harden XML, ZIP, network, and file handling
(#731, #732, #734, #736, #738, #743)
- Other fixes, optimizations, and documentation updates
(#727, #733, #753, #755, #757)
Full Changelog: https://github.com/open-eid/libdigidocpp/compare/v4.4.0...v4.5.0

We appreciate your feedback to www.id.ee.
- Update libraries and platform support
(#702, #705, #713, #721)
- Improve signature and container compatibility
(#698, #708, #701, #650, #711, #724)
- Other fixes and optimizations
(#691, #700, #704, #706, #707, #718, #719)
Full Changelog: https://github.com/open-eid/libdigidocpp/compare/v4.3.0...v4.4.0

We appreciate your feedback to www.id.ee.
- Update libraries and platform support (#681, #687)
- Improve signature and container compatibility (#672, #627, #699, #676, #690, #683, #650, #674, #699)
- Other fixes and optimizations (#689, #688, #693, #696, #703)
Full Changelog: https://github.com/open-eid/libdigidocpp/compare/v4.2.1...v4.3.0

We appreciate your feedback to www.id.ee.
- Critical fix (#690)
- Update libraries and platform support (#672, #676)
- Improve signature and container compatibility (#681)
Full Changelog: https://github.com/open-eid/libdigidocpp/compare/v4.2.0...v4.2.1

We appreciate your feedback to www.id.ee.
- Update libraries and platform support
(#620, #651, #654, #655, #662, #659, #667)
- Improve signature and container compatibility
(#660)
- Other fixes and optimizations
(#653, #664, #657, #666, #663, #661)
Full Changelog: https://github.com/open-eid/libdigidocpp/compare/v4.1.0...v4.2.0

We appreciate your feedback to www.id.ee.
- Update libraries and platform support
(#629, #633, #642, #638, #621, #643, #648, #636)
- Improve signature and container compatibility
(#623, #626, #624, #646, #640, #645, #647, #644)
- Other fixes and optimizations
(#625, #632, #631, #594, #649)
Full Changelog: https://github.com/open-eid/libdigidocpp/compare/v4.0.0...v4.1.0