Version: Improve date version parsing

The existing date version parsing regex only matches file names that
have a prefix (e.g., `ltopers-v2017-04-14.tar.gz`), so it doesn't
match files like `2023-09-28.tar.gz`. There are a handful of formulae
that have to manually specify the version as a result (e.g.,
`marksman`, `sqtop`, etc.). `bootloadhid` is also affected but that's
because the filename uses a dot as the prefix delimiter (e.g.,
`bootloadHID.2012-12-08.tar.gz`) and the regex only matches a hyphen.

This addresses these shortcomings by using `[._-]` as the prefix
delimiter and making it optional.

Library/Homebrew/version.rb

@@ -376,8 +376,9 @@ def self.parse(spec, detected_from_url: false)
 
   VERSION_PARSERS = [
     # date-based versioning
+    # e.g. 2023-09-28.tar.gz
     # e.g. ltopers-v2017-04-14.tar.gz
-    StemParser.new(/-v?(\d{4}-\d{2}-\d{2})/),
+    StemParser.new(/[._-]?v?(\d{4}-\d{2}-\d{2})/),
 
     # GitHub tarballs
     # e.g. https://github.com/foo/bar/tarball/v1.2.3