minor: fix typo in commemt

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: sebhmg

.github/workflows/zizmor-security-mira.yml

@@ -20,7 +20,7 @@ on:
 jobs:
   call-workflow-zizmor:
     name: Zizmor analysis
-    # run on the Mira repo only (upstram SimPEG repo has its own workflow for Zizmor)
+    # run on the Mira repo only (upstream SimPEG repo has its own workflow for Zizmor)
     if: startsWith(github.repository, 'MiraGeoscience/')
     permissions:
       contents: read