I am uploading a NMU to DELAYED/10 in order to fix this.
Please find the debdiff attached.
diff -Nru etckeeper-1.18.20/debian/changelog etckeeper-1.18.20/debian/changelog
--- etckeeper-1.18.20/debian/changelog 2023-01-26 20:53:08.000000000 +0100
+++ etckeeper-1.18.20/debian/changelog 2023-12-17 22:15:13.000000000 +0100
@@ -1,3 +1,10 @@
+etckeeper (1.18.20-1.1) unstable; urgency=medium
+
+ * Non-maintainer upload
+ * Replace transitional Build-Depends: bzr with brz (Closes: #1058894)
+
+ -- Bastian Germann <b...@debian.org> Sun, 17 Dec 2023 22:15:13 +0100
+
etckeeper (1.18.20-1) unstable; urgency=medium
[ Debian Janitor ]
diff -Nru etckeeper-1.18.20/debian/control etckeeper-1.18.20/debian/control
--- etckeeper-1.18.20/debian/control 2023-01-26 20:53:08.000000000 +0100
+++ etckeeper-1.18.20/debian/control 2023-12-17 22:15:13.000000000 +0100
@@ -3,7 +3,7 @@
Priority: optional
Build-Depends: debhelper-compat (= 13),
bats,
- bzr,
+ brz,
dh-python,
fakeroot,
git,
