Fix IPv6 addresses (3.0)

Local and ULA and other IPv6 adresses were incorrectly filtered by ``awk '/^[0-9]/ { print $1 }'`` which searches in the first term for numeric values only.

This PR adds a-f and fixes #2529 for the 3.0 branch.

Author: drwetter

testssl.sh

@@ -18165,9 +18165,9 @@ get_aaaa_record() {
           elif "$HAS_HOST"; then
                ip6=$(filter_ip6_address $(host -t aaaa "$1" | awk '/address/ { print $NF }'))
           elif "$HAS_DRILL"; then
-               ip6=$(filter_ip6_address $(drill aaaa "$1" | awk '/ANSWER SECTION/,/AUTHORITY SECTION/ { print $NF }' | awk '/^[0-9]/'))
+               ip6=$(filter_ip6_address $(drill aaaa "$1" | awk '/ANSWER SECTION/,/AUTHORITY SECTION/ { print $NF }' | awk '/^[a-f0-9]/'))
           elif "$HAS_DIG"; then
-               ip6=$(filter_ip6_address $(dig $DIG_R +short +timeout=2 +tries=2 $noidnout -t aaaa "$1" 2>/dev/null | awk '/^[0-9]/ { print $1 }'))
+               ip6=$(filter_ip6_address $(dig $DIG_R +short +timeout=2 +tries=2 $noidnout -t aaaa "$1" 2>/dev/null | awk '/^[a-f0-9]/ { print $1 }'))
           elif "$HAS_NSLOOKUP"; then
                ip6=$(filter_ip6_address $(strip_lf "$(nslookup -type=aaaa "$1" 2>/dev/null | awk '/'"^${a}"'.*AAAA/ { print $NF }')"))
           fi