pak 0.7.0

• pak now correctly handles the latest GitHub release with
  the @*release notation (@pawelru,
  r-lib/pkgdepends#321)

• pak now correctly handles having multiple instances of the same
  package in the metadata, with different R version requirements
  (#534, #538, r-lib/pkgdepends#331).

• git:: package references work better now for Azure DevOps
  (@jameslairdsmith, r-lib/pkgdepends#333,
  r-lib/pkgdepends#342).

• pak now does a better job at accepting installed packages, and
  avoids reinstalling more packages than needed when using a lock file
  (r-lib/actions#759,
  r-lib/pkgdepends#338).