Log Message:
shellcheck: update to version 0.9.0

ChangeLog:

v0.9.0 - 2022-12-12
Added
    SC2316: Warn about 'local readonly foo' and similar (thanks, patrickxia!)
    SC2317: Warn about unreachable commands
    SC2318: Warn about backreferences in 'declare x=1 y=$x'
    SC2319/SC2320: Warn when $? refers to echo/printf/[ ]/[[ ]]/test
    SC2321: Suggest removing ((..))inarray[((idx))]=val
    SC2322: Suggest collapsing double parentheses in arithmetic contexts
    SC2323: Suggest removing wrapping parentheses in a[(x+1)]=val

Fixed
    SC2086: Now uses DFA to make more accurate predictions about values
    SC2086: No longer warns about values declared as integer with declare -i

Changed
    ShellCheck now has a Data Flow Analysis engine to make smarter decisions
    based on control flow rather than just syntax. Existing checks will
    gradually start using it, which may cause them to trigger differently
    (but more accurately).
    Values in directives/shellcheckrc can now be quoted with '' or ""