Fix non-US english by using "parentheses" instead of "brackets"

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: owen-mc

actions/ql/lib/codeql/actions/Bash.qll

@@ -793,7 +793,7 @@ module Bash {
       r1 = "\\[([09azAZ_-]+)\\]" and
       // The same as above, followed by a quantifier like `+` or `{20}`
       r2 = r1 + "(\\+|\\{\\d+\\})" and
-      // The same as above, possibly with brackets around it
+      // The same as above, possibly with parentheses around it
       r3 = "\\(?" + r2 + "\\)?" and
       // The same as above, possibly with a `?` after it
       r4 = r3 + "\\??"