Wget2: äldre versioner att ladda ner

Use GPG key 0x08302DB6A2670428 to check signatures.
Noteworthy changes
- Fix file overwrite issue with metalink
- Fix remote buffer overflow in get_local_filename_real()
- Fix a redirect/mirror regression from 400713ca
- Use the local system timestamp when requested via --no-use-server-timestamps
- Prevent file truncation with --no-clobber
- Improve messages about why URLs are not being followed
- Fix metalink with -O/--output-document
- Fix sorting of metalink mirrors by priority
- Add --show-progress to improve backwards compatibility to wget
- Fix buffer overflow in wget_iri_clone() after wget_iri_set_scheme()
- Allow 'no_' prefix in config options
- Use libnghttp2 for HTTP/2 testing
- Fix WolfSSL build issue if SSLv2 isn't built into the library
- Set exit status to 8 on 403 response code
- Fix convert-links
- Fix --server-response for HTTP/1.1
- Fix anchor links in README.md for Gitlab
- Fix html examples in the documentation
- Improvements on code, docs and CI/testing