a2 status, issue tracker update (ocaml5, unmaintained systems)

1) So far there have been no problems reported against 2.53.8a2.  There
are likely to be various minor changes but I don't anticipate anything
significant -- so 2.53.8 will probably look like 2.53.8a2.  If you
haven't tried it yet, please do.

2) Two updates to issue tracker guidelines:

  ocaml 5.4.0 appears to no longer have the 'not ready' label that
  earlier ocmal 5 does, so it's now ok to file bugs that Unison doesn't
  build/work with Ocaml 5.4.0 or later, with a caveat: You must have
  tried to reproduce with 4.14 and explain if the problem occurs there
  too, or that it doesn't.  That will let us be clear from the beginning
  if it is an issue specific to ocaml 5, which is both a huge clue about
  the problem, and lets people who don't want to deal with ocaml 5 not
  deal with it.

  Bug reports are only accepted for maintained operating systems.  It's
  not a Unison bug to fail to build on Sixth Edition UNIX from 1977!  It
  was simply an oversight not to have said this earlier, as I didn't
  anticipate retrocomputing issues.  (Clean PRs are welcome to improve
  Unison on unmaintained/ancient systems.)

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