tools: Fix Python exception when uprev tast external file

The regex pattern should be string or it raises TypeError exception.

BUG=b:342335042
TEST=manual tested by uprev new images

Change-Id: Ica38a7327438ab05f57598713f389b7a52744b36
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crospts/+/5579594
Auto-Submit: Darren Wu <darrenwu@chromium.org>
Reviewed-by: David Stevens <stevensd@chromium.org>
Tested-by: Darren Wu <darrenwu@chromium.org>
Commit-Queue: David Stevens <stevensd@chromium.org>
1 file changed
tree: 70410a6276a915bf5546210060ca741717a5dcfa
  1. build/
  2. docs/
  3. tools/
  4. .gitignore
  5. DIR_METADATA
  6. OWNERS
  7. PRESUBMIT.cfg