chore(actions): do NOT build arm64 on python3.8 and earlier

It seems that arm64 builds are not well-supported on these platforms so
we will skip building the arm64 version on these, for now.

Note that he glob pattern for 3.8 has to be a bit more permissive as the
cibuild pattern aren't fully respected on on github actions for some
reason. The patterns, filters and 'skip' values work correctly works
locally for `cp3{6,7,8}-*-*arm64` bit on github does not match
`cp38-macosx_arm64` - even accounting for the underscore, although the
glob does work for cp36 and cp37... I don't want to be in this position
where I'm debugging `cibuilwheel`.

pyproject.toml

@@ -22,8 +22,12 @@ maintainers = [
 # tmap's developement in the future.
 # This may change, and probably should.
 build = "cp3*"
-# Skip 32-bit builds, musl build, and pypy builds
-skip = ["*-manylinux_i686", "*-musllinux_*", "pp*"]
+# Skip
+# - 32-bit builds
+# - musl build
+# - pypy builds
+# - arm64 for build for python 3.8 and earlier
+skip = ["*-manylinux_i686", "*-musllinux_*", "pp*", "cp3{6,7,8}*arm64", "cp38*arm64" ]
 
 [tool.cibuildwheel.linux]
 before-build = """\