lint: ignore gitian keys file for spelling linter

Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>

test/lint/lint-spelling.ignore-words.txt

@@ -1,5 +1,4 @@
 asend
-atack
 blockin
 cachable
 fo

test/lint/lint-spelling.sh

@@ -15,6 +15,6 @@ if ! command -v codespell > /dev/null; then
 fi
 
 IGNORE_WORDS_FILE=test/lint/lint-spelling.ignore-words.txt
-if ! codespell --check-filenames --disable-colors --quiet-level=7 --ignore-words=${IGNORE_WORDS_FILE} $(git ls-files -- ":(exclude)build-aux/m4/" ":(exclude)contrib/seeds/*.txt" ":(exclude)depends/" ":(exclude)doc/release-notes/" ":(exclude)src/leveldb/" ":(exclude)src/crc32c/" ":(exclude)src/qt/locale/" ":(exclude)src/qt/*.qrc" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/"); then
+if ! codespell --check-filenames --disable-colors --quiet-level=7 --ignore-words=${IGNORE_WORDS_FILE} $(git ls-files -- ":(exclude)build-aux/m4/" ":(exclude)contrib/seeds/*.txt" ":(exclude)depends/" ":(exclude)doc/release-notes/" ":(exclude)src/leveldb/" ":(exclude)src/crc32c/" ":(exclude)src/qt/locale/" ":(exclude)src/qt/*.qrc" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/" ":(exclude)contrib/gitian-keys/keys.txt"); then
     echo "^ Warning: codespell identified likely spelling errors. Any false positives? Add them to the list of ignored words in ${IGNORE_WORDS_FILE}"
 fi