Fix version determination for 10.x

The old glob assumed one digit before the ".". Now pick anything
that doesn't start with "v" and is on the main branch. These are
always merge commits. Code merged in is on the second parent.

py/version.py

@@ -9,15 +9,17 @@ def get_version_info_from_git(repo_path, extra_args=[]):
         # Note: git describe doesn't work if no tag is available
         try:
             git_tag = subprocess.check_output(
-                # CIRCUITPY-CHANGE
+                # CIRCUITPY-CHANGE: Ignore MicroPython tags that start with v.
+                # Also ignore tags that are on merged in branches.
                 [
                     "git",
                     "describe",
                     "--dirty",
                     "--tags",
                     "--always",
+                    "--first-parent",
                     "--match",
-                    "[1-9].*",
+                    "[!v]*",  # This is a glob, not a regex
                     *extra_args,
                 ],
                 cwd=repo_path,