chore(deps): update dependency shfmt to v3.13.1 (9.4)

[elastic-renovate-prod]

This PR contains the following updates:

Package	Update	Change
shfmt	minor	3.12.0 -> 3.13.1

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Release Notes

mvdan/sh (shfmt)

v3.13.1

• cmd/shfmt
  • Add support for [[zsh]] in EditorConfig files
  • Detect the shell variant from filenames like .zshrc and .bash_profile
  • Fix --apply-ignore when used with explicit args - #​1310
• syntax
  • Revert an accidental change to how array subscripts are formatted - #​1314
  • Never join ;; with the previous line when formatting - #​1289
  • Fix a bug where $1[foo] was parsed as a subscript in Zsh - #​1288
  • Correctly parse $! in double quotes in Zsh - #​1298
  • Allow indexing into special parameters in Zsh - #​1299
  • Allow parameter expansions with empty names in Zsh - #​1280
• interp
  • Test against Bash 5.3 and fix three new discrepancies
  • Fix a few bugs related to nameref variables
  • Avoid panics when user input encounters unimplemented features

v3.13.0

This release introduces support for Zsh
in the parser and formatter, which was tracked in issue #​120
alongside the label https://github.com/mvdan/sh/labels/zsh.
While support is not complete, it should be far enough for many use cases.

This release also drops support for Go 1.24 and includes many other enhancements:

• cmd/shfmt
  • Exit with a non-zero status when -l prints any filenames
  • shfmt -version is now derived from the git current tag, dropping the -ldflags workaround
• syntax
  • New nodes types and node fields are introduced alongside LangZsh
  • LangVariant is now a bitset, allowing the use of sets like "Bash-like"
  • Add InteractiveSeq and StmtsSeq iterator methods for Parser
  • Stop exposing the internal buffer in Printer via struct embedding
  • Support the use of brace expansions like declare {a,b}_c=value
  • Fix a bug where POSIX and Bash incorrectly allowed empty command lists
• interp
  • Add support for shopt -s dotglob and shopt -s extglob
  • Add support for simple uses of !(expr) extended glob patterns
  • Support more builtin flags for declare, type, read
  • Fix various bugs relating to nulls, errors, and arrays
• expand
  • Add Config.DotGlob and Config.ExtGlob for the interpreter
  • Add Variable.Flags to get the one-character declare flags
  • Do not force env vars on Windows to be uppercase
  • Fix various bugs relating to glob pattern matching
• pattern
  • Add GlobLeadingDot and ExtendedOperators for the interpreter
  • Add NegExtGlobError to mark the use of !(expr) negation patterns

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[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-04-16 20:23 UTC · Rule: default
• ✅ Checks started · on draft merge queue: embarking 9.4 (462416a), #4478 and #4479 together #4669
• 🚫 Left the queue — 2026-04-16 21:02 UTC · at f4e906b6000575584b3d1a55f2a7f0a05016ee99

This pull request spent 39 minutes 15 seconds in the queue, with no time running CI.

Reason

Pull request #4479 has been merged manually at 4a89c16

Hint

You were too fast!