fix: lock lazy decompressor pool init on Julia < 1.12

[Beforerr]

Unlocked lazy init raced when first called inside @threads: workers each built a pool, and one blocked forever returning its decompressor to the other (full) pool. Reproduced on 1.10 with JULIA_NUM_THREADS=8 reading an ELFIN EPD file (3/3 hang on 0.4.2, 5/5 OK with this fix).

[codecov]

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[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	8710657...	main / 8710657...
elx/full_load	25.4 ± 2.1 μs	25.5 ± 1.9 μs	0.996 ± 0.11
elx/sum_array	2.73 ± 1.2 μs	2.71 ± 1.2 μs	1.01 ± 0.63
elx/sum_lazy	2.9 ± 0.43 μs	2.85 ± 0.51 μs	1.02 ± 0.24
elx/sum_var_access	2.15 ± 1.2 μs	2.15 ± 1.2 μs	1 ± 0.79
elx/var_access	0.121 ± 0.01 μs	0.12 ± 0.011 μs	1.01 ± 0.12
epochs/DateTime_to_TT2000	0.0622 ± 0.0004 ms	0.0623 ± 0.00029 ms	0.999 ± 0.0079
epochs/Epoch16_parse	0.311 ± 0.011 ms	0.311 ± 0.011 ms	1 ± 0.051
epochs/Epoch16_vs_DateTime	2.92 ± 0.01 μs	2.92 ± 0.019 μs	1 ± 0.0074
epochs/TT2000_parse	0.362 ± 0.011 ms	0.361 ± 0.011 ms	1 ± 0.043
epochs/TT2000_string	5.76 ± 1.9 ms	5.83 ± 1.9 ms	0.988 ± 0.46
epochs/TT2000_to_DateTime	0.112 ± 0.00099 ms	0.116 ± 0.00086 ms	0.964 ± 0.011
epochs/TT2000_vs_DateTime	0.0525 ± 2e-05 ms	0.0535 ± 8e-05 ms	0.982 ± 0.0015
mms/full_load	17.1 ± 2 μs	17.6 ± 2 μs	0.972 ± 0.16
mms/sum_array	0.0954 ± 0.0022 s	0.0953 ± 0.0017 s	1 ± 0.03
mms/sum_slice	3.55 ± 0.48 ms	3.53 ± 0.49 ms	1.01 ± 0.19
mms/sum_var_access	3.52 ± 0.47 ms	3.52 ± 0.48 ms	1 ± 0.19
mms/var_access	0.08 ± 0.02 μs	0.07 ± 0.001 μs	1.14 ± 0.29
time_to_load	0.182 ± 0.0024 s	0.18 ± 0.0027 s	1.01 ± 0.02

Memory benchmarks

	main	8710657...	main / 8710657...
elx/full_load	0.217 k allocs: 24.8 kB	0.217 k allocs: 24.8 kB	1
elx/sum_array	12 allocs: 28 kB	12 allocs: 28 kB	1
elx/sum_lazy	12 allocs: 28 kB	12 allocs: 28 kB	1
elx/sum_var_access	14 allocs: 28.3 kB	14 allocs: 28.3 kB	1
elx/var_access	1 allocs: 0.234 kB	1 allocs: 0.234 kB	1
epochs/DateTime_to_TT2000	3 allocs: 0.0764 MB	3 allocs: 0.0764 MB	1
epochs/Epoch16_parse	3 allocs: 0.153 MB	3 allocs: 0.153 MB	1
epochs/Epoch16_vs_DateTime	0 allocs: 0 B	0 allocs: 0 B
epochs/TT2000_parse	3 allocs: 0.0764 MB	3 allocs: 0.0764 MB	1
epochs/TT2000_string	0.2 M allocs: 7.02 MB	0.2 M allocs: 7.02 MB	1
epochs/TT2000_to_DateTime	3 allocs: 0.0764 MB	3 allocs: 0.0764 MB	1
epochs/TT2000_vs_DateTime	0 allocs: 0 B	0 allocs: 0 B
mms/full_load	0.056 k allocs: 5.77 kB	0.056 k allocs: 5.77 kB	1
mms/sum_array	0.531 k allocs: 31.6 MB	0.531 k allocs: 31.6 MB	1
mms/sum_slice	0.05 k allocs: 1.29 MB	0.05 k allocs: 1.29 MB	1
mms/sum_var_access	0.05 k allocs: 1.29 MB	0.05 k allocs: 1.29 MB	1
mms/var_access	1 allocs: 0.219 kB	1 allocs: 0.219 kB	1
time_to_load	0.2 k allocs: 11.8 kB	0.2 k allocs: 11.8 kB	1