Fix data race in jl_new_module__ (#58880)
Use an atomic fetch and add to fix a data race in `Module()` identified
by tsan:
```
./usr/bin/julia -t4,0 --gcthreads=1 -e 'Threads.@threads for i=1:100 Module() end'
==================
WARNING: ThreadSanitizer: data race (pid=5575)
Write of size 4 at 0xffff9bf9bd28 by thread T9:
#0 jl_new_module__ /home/user/c/julia/src/module.c:487:22 (libjulia-internal.so.1.13+0x897d4)
#1 jl_new_module_ /home/user/c/julia/src/module.c:527:22 (libjulia-internal.so.1.13+0x897d4)
#2 jl_f_new_module /home/user/c/julia/src/module.c:649:22 (libjulia-internal.so.1.13+0x8a968)
#3 <null> <null> (0xffff76a21164)
#4 <null> <null> (0xffff76a1f074)
#5 <null> <null> (0xffff76a1f0c4)
#6 _jl_invoke /home/user/c/julia/src/gf.c (libjulia-internal.so.1.13+0x5ea04)
#7 ijl_apply_generic /home/user/c/julia/src/gf.c:3892:12 (libjulia-internal.so.1.13+0x5ea04)
#8 jl_apply /home/user/c/julia/src/julia.h:2343:12 (libjulia-internal.so.1.13+0x9e4c4)
#9 start_task /home/user/c/julia/src/task.c:1249:19 (libjulia-internal.so.1.13+0x9e4c4)
Previous write of size 4 at 0xffff9bf9bd28 by thread T10:
#0 jl_new_module__ /home/user/c/julia/src/module.c:487:22 (libjulia-internal.so.1.13+0x897d4)
#1 jl_new_module_ /home/user/c/julia/src/module.c:527:22 (libjulia-internal.so.1.13+0x897d4)
#2 jl_f_new_module /home/user/c/julia/src/module.c:649:22 (libjulia-internal.so.1.13+0x8a968)
#3 <null> <null> (0xffff76a21164)
#4 <null> <null> (0xffff76a1f074)
#5 <null> <null> (0xffff76a1f0c4)
#6 _jl_invoke /home/user/c/julia/src/gf.c (libjulia-internal.so.1.13+0x5ea04)
#7 ijl_apply_generic /home/user/c/julia/src/gf.c:3892:12 (libjulia-internal.so.1.13+0x5ea04)
#8 jl_apply /home/user/c/julia/src/julia.h:2343:12 (libjulia-internal.so.1.13+0x9e4c4)
#9 start_task /home/user/c/julia/src/task.c:1249:19 (libjulia-internal.so.1.13+0x9e4c4)
Location is global 'jl_new_module__.mcounter' of size 4 at 0xffff9bf9bd28 (libjulia-internal.so.1.13+0x3dbd28)
```
