Switch update-circt action to v1

Change the version of the update-circt action from v1.0.0 to v1.  This
pulls in a change from v1.0.1 which fixes a bug where the staging branch
was not updated.  (I have no idea if this is being used.)  However, this
generally future-proofs the action by having it pull from v1 which is
manually updated to match the latest v1 release (pulling in minor and
patch changes).

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

.github/workflows/update-circt.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Update CIRCT
-        uses: circt/update-circt@v1.0.0
+        uses: circt/update-circt@v1
         with:
           user: 'bartender'
           email: 'firesimchipyard@gmail.com'