update the release tag to meet git tag requirements (#1339)

git tags cant have colons

Author: mtblanton

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
 
       - name: Get current date
         id: get-date
-        run: echo "DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ")" >> $GITHUB_OUTPUT
+        run: echo "DATE=$(date -u +"%Y-%m-%dT%H-%M-%SZ")" >> $GITHUB_OUTPUT
 
       - name: Make tag name
         id: make-tag-name