GH-44432: [Swift] Use flatbuffers v24.3.7

[kou]

Rationale for this change

flatbuffers v24.3.7 includes google/flatbuffers#8134 .

The current master has a build error:

https://github.com/apache/arrow/actions/runs/11357784776/job/31591213976?pr=44431#step:5:1114

[51/77] Compiling Arrow ArrowType.swift
/arrow/swift/Arrow/Sources/Arrow/File_generated.swift:107:206: error: value of type 'Table' has no member 'postion'
  public var schema: org_apache_arrow_flatbuf_Schema? { let o = _accessor.offset(VTOFFSET.schema.v); return o == 0 ? nil : org_apache_arrow_flatbuf_Schema(_accessor.bb, o: _accessor.indirect(o + _accessor.postion)) }
                                                                                                                                                                                                   ~~~~~~~~~ ^~~~~~~

What changes are included in this PR?

Use v24.3.7 instead of master.

Are these changes tested?

Yes.

Are there any user-facing changes?

No.

• GitHub Issue: [Swift] Build failure with google/flatbuffers master #44432

[github-actions]

⚠️ GitHub issue #44432 has been automatically assigned in GitHub to PR creator.

[kou]

@abandy What do you think about this?

[abandy]

@abandy What do you think about this?

Makes sense to pin the version to prevent potential errors from changes in master. Good idea, thank you!

[kou]

Thanks for your review.
I'll merge this.

[conbench-apache-arrow]

After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit bb900c1.

There were no benchmark performance regressions. 🎉

The full Conbench report has more details. It also includes information about 5 possible false positives for unstable benchmarks that are known to sometimes produce them.