test: Enable SC2046 shellcheck rule

ci/lint/06_script.sh

@@ -31,7 +31,8 @@ if [ "$CIRRUS_REPO_FULL_NAME" = "bitcoin/bitcoin" ] && [ "$CIRRUS_PR" = "" ] ; t
     # sanity checking only a few (10) commits seems sufficient and cheap.
     git log HEAD~10 -1 --format='%H' > ./contrib/verify-commits/trusted-sha512-root-commit
     git log HEAD~10 -1 --format='%H' > ./contrib/verify-commits/trusted-git-root
-    ${CI_RETRY_EXE}  gpg --keyserver hkps://keys.openpgp.org --recv-keys $(<contrib/verify-commits/trusted-keys) &&
+    mapfile -t KEYS < contrib/verify-commits/trusted-keys
+    ${CI_RETRY_EXE} gpg --keyserver hkps://keys.openpgp.org --recv-keys "${KEYS[@]}" &&
     ./contrib/verify-commits/verify-commits.py;
 fi