Update dependency shellcheck to v0.9.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
shellcheck	minor	0.8.0 -> 0.9.0

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Release Notes

koalaman/shellcheck (shellcheck)

v0.9.0

Compare Source

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 $((..)) in array[$((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 ""

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