test: deterministic commit timestamps in test PRs

now that the remote helper uses the commit author timestamp to
determine if commit was applied from a proposal, the timestamps
in the test proposal can no longer be identical.

this makes them deterministically different based on the file name

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 819a249..51a7472 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3314,6 +3314,7 @@ dependencies = [
  "once_cell",
  "rand",
  "rexpect",
+ "sha2",
  "simple-websockets",
  "strip-ansi-escapes",
  "tokio",