Release 6.0.9

• Upgrades Boost to 1.76. Fixes a regression where some boost headers for comatibility with older distros were missing.

• Make building on Apple Silcon using homebrew openssl work. Contributed by TheBerg.

• Add Support for Ubuntu Hirsute.

• Remove prebuilt packages for Ubuntu Groovy.

• Properly support HTTP 418. Contributed by Thomas Pfister.

• Fix several C++ warnings about implicit copy operators/constructors.

• Bump preferred nginx 1.18.0 → 1.20.1.

• Updated various library versions used in precompiled binaries (used for e.g. gem installs):

  • ccache 4.2 → 4.3
  • cmake 3.19.7 → 3.20.3
  • curl 7.75.0 → 7.77.0
  • git 2.31.0 → 2.31.1
  • gnupg 2.2.27 → 2.3.1
  • libgcrypt 1.9.2 → 1.9.3
  • libksba 1.5.0 → 1.5.1
  • ntbTLS added → 0.2.0
  • zlib 1.4.9 → 1.5.0
  • rubygems 3.2.15 → 3.2.19
  • ruby:
    • 2.3.8 → removed
    • 2.5.8 → 2.5.9
    • 2.6.6 → 2.6.7
    • 2.7.2 → 2.7.3
    • 3.0.0 → 3.0.1