dnsapi/dns_lexicon.sh: shellcheck: fix 4 occurences of SC2021:
"Don't use [] around ranges in tr, it replaces literal square brackets." this introduces another warning: "Use '[:lower:]' to support accents and foreign alphabets." This is more a style thingy because we really want to only catch A-Z. work around this by using a shellcheck-directive and a comment that the [:lower:] will not work with e.g. busybox-ash. if we later really want to use [:lower:], we should use 'sed' for that.
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