ANN: stack-2.7.3

[Emanuel Borsboom]

See https://haskellstack.org/ for installation and upgrade instructions.

**Changes since v2.7.1:**

Other enhancements:

* `stack upgrade` will download from `haskellstack.org` before trying
`github.com`. See
[#5288](https://github.com/commercialhaskell/stack/issues/5288)
* `stack upgrade` makes less assumptions about archive format. See
[#5288](https://github.com/commercialhaskell/stack/issues/5288)
* Add a `--no-run` flag to the `script` command when compiling.

Bug fixes:

* GHC source builds work properly for recent GHC versions again. See
[#5528](https://github.com/commercialhaskell/stack/issues/5528)
* `stack setup` always looks for the unpacked directory name to support
different tar file naming conventions. See
[#5545](https://github.com/commercialhaskell/stack/issues/5545)
* Bump `pantry` version for better OS support. See
[pantry#33](https://github.com/commercialhaskell/pantry/issues/33)
* When building the sanity check for a new GHC install, make sure to clear
`GHC_PACKAGE_PATH`.
* Specifying GHC RTS flags in the `stack.yaml` no longer fails with an error.
[#5568](https://github.com/commercialhaskell/stack/pull/5568)
* `stack setup` will look in sandboxed directories for executables, not
relying on `findExecutables. See
[GHC issue 20074](https://gitlab.haskell.org/ghc/ghc/-/issues/20074)
* Track changes to `setup-config` properly to avoid reconfiguring on every
change. See [#5578](https://github.com/commercialhaskell/stack/issues/5578)

**Thanks to all our contributors for this release:**

* Andreas Källberg
* Artur Gajowy
* Felix Yan
* fwcd
* Ketzacoatl
* Matt Audesse
* Michael Snoyman
* milesfrain
* parsonsmatt
* skforg