secret-tool is provided by library/libsecret package.

--- bash-completion-2.16.0/completions/Makefile.am.orig
+++ bash-completion-2.16.0/completions/Makefile.am
@@ -397,7 +397,6 @@
 		sbopkg \
 		screen \
 		scrub \
-		secret-tool \
 		set \
 		sh \
 		sha256sum \