fix(ci): quote auto-tag if expression to avoid YAML parse error

[luarss]

The if condition in auto-tag.yml contained a bare colon inside a single-quoted string, which the YAML parser treated as a mapping value delimiter.

Fix: wrap the entire expression in double quotes.

# before
if: startsWith(github.event.head_commit.message, 'chore: release v')

# after
if: "startsWith(github.event.head_commit.message, 'chore: release v')"

make check passes cleanly after this change.