find-arch-on-crt.sh: adjust for patsub_replacement

This shell behavior[1] in Bash 5.2 "expands occurrences of '&' in the
replacement string of pattern substitution to the text matched by the
pattern" but we want literal ampersands so escape them.

[1] https://www.gnu.org/software/bash/manual/html_node/The-Shopt-Builtin.html

misc/find-arch-on-crt.sh

@@ -11,7 +11,7 @@ readonly DOMAINS=(
   archlinux.page
 )
 readonly LOOKUP_URLS=(
-  "${DOMAINS[@]/#/https://crt.sh/?exclude=expired&deduplicate=Y&output=json&q=}"
+  "${DOMAINS[@]/#/https://crt.sh/?exclude=expired\&deduplicate=Y\&output=json\&q=}"
 )
 
 names() {