[GLib][FlightRPC] Test sometimes crashed

[kou]

Describe the enhancement requested

https://github.com/apache/arrow/actions/runs/11605625816/job/32316330868?pr=44591#step:6:5263

+ ruby test/run-test.rb
/arrow/c_glib /
[BUG] Segmentation fault at 0x0000000000000090
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux-gnu]

-- Machine register context ------------------------------------------------
 RIP: 0x00007f1668748614 RBP: 0x00007f15efffe360 RSP: 0x00007f15efffe2b0
 RAX: 0x0000000000000000 RBX: 0x0000000000000000 RCX: 0x00007f15f000cba0
 RDX: 0x0000000000000001 RDI: 0x000055deb0448500 RSI: 0x0000000000000001
  R8: 0x000055deaf54ba60  R9: 0x0000000000000000 R10: 0x00007f167999c328
 R11: 0x00007f16799b0c50 R12: 0x000055deafda4328 R13: 0x00007f15f000ba80
 R14: 0x00007f15efffe980 R15: 0x00007fffc717aba0 EFL: 0x0000000000010206

-- C level backtrace information -------------------------------------------
/lib/x86_64-linux-gnu/libruby-3.0.so.3.0(0x7f167d72c0e0) [0x7f167d72c0e0]
/lib/x86_64-linux-gnu/libruby-3.0.so.3.0(0x7f167d5804f4) [0x7f167d5804f4]
/lib/x86_64-linux-gnu/libruby-3.0.so.3.0(0x7f167d6a04ed) [0x7f167d6a04ed]
/lib/x86_64-linux-gnu/libc.so.6(0x7f167d2fa520) [0x7f167d2fa520]
/usr/local/lib/libarrow-flight-glib.so.1900(_ZN8gaflight23ServerCustomAuthHandler7IsValidERKN5arrow6flight17ServerCallContextERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPSB_+0xa8) [0x7f1668748614]
[0x7f166200d884]
[0x7f166200e5f4]
[0x7f1662025a88]
[0x7f1662029821]
[0x7f166202871b]
[0x7f1662027721]
[0x7f1662058785]
[0x7f166204f1b7]
[0x7f16620587e1]
[0x7f166204f27e]
[0x7f16620bd658]
[0x7f16620bd42a]
[0x7f16620bdce1]
[0x7f16620d16a5]
[0x7f16620d0bb5]
[0x7f16620d0a3c]
[0x7f16620d0a60]
[0x7f1662714060]
[0x7f16627140ad]
[0x7f167d34cac3]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x44) [0x7f167d3dda04]

It may be related to GC.

Component(s)

FlightRPC, GLib