Bump mvdan/sh from 3.10.0 to 3.11.0 in lib/tools/shellfmt.sh

[github-actions]

Bump mvdan/sh from 3.10.0 to 3.11.0 by bumping SHELLFMT_VERSION in lib/tools/shellfmt.sh.

Release notes

Sourced from mvdan/sh's releases.
Please note that this only shows the release notes for the latest release.

This release drops support for Go 1.22 and includes many enhancements.

• cmd/shfmt
  • Support -l=0 and -f=0 to split filenames with null bytes - cmd/shfmt: support null byte separators in --list and --find mvdan/sh#1096
• syntax
  • New iterator API: Parser.WordsSeq
  • Fix Parser.Incomplete and IsIncomplete to work well with Parser.Words - syntax: IsIncomplete only works with Interactive mvdan/sh#937
  • Initial support for parsing incomplete shell via RecoverErrors
  • Expand LangError to include which language was used when parsing
• interp
  • Refactor setting variables to fix array declaration edge cases - Associative array is broken. Regression?  mvdan/sh#1108
  • Fix test read/write/exec operators to work correctly on directories - Incorrect way to handle directory read/write access checks in the test command mvdan/sh#1116
  • Replace the cancelreader dependency with os.File.SetReadDeadline
  • Avoid waiting for process substitutions, matching Bash
  • Skip OpenHandler when opening named pipes for process substitutions - FIFO File Descriptors Created in process substitution aren't handled consistently mvdan/sh#1120
  • Use TMPDIR if set via Env to create temporary files such as named pipes
• expand
  • New iterator API: FieldsSeq
  • Correctly handle repeated backslashes in double quotes - Sequential Backslashes are removed during interpretation. mvdan/sh#1106
  • Don't expand backslashes inside here-documents - interp: here-doc backslash is not preserved mvdan/sh#1070
  • Replace the Unset kind with a new Variable.Set boolean field

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Binaries built on go version go1.24.0 linux/amd64 with:

CGO_ENABLED=0 go build -trimpath -ldflags="-w -s -X=main.version=v3.11.0"