refactor: remove workaround for python <3.7

[jbedard]

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Test plan

• Covered by existing test cases

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[github-actions]

py_binary startup benchmark

Version	Mean (ms)	Median (ms)	± stddev	vs BCR	vs main	Build (s)
BCR 1.11.7 (baseline)	188.479	186.963	±6.681	—	—	59.94
HEAD main	59.830	59.464	±1.670	-68.3%	—	9.43
This PR	59.942	59.385	±3.041	-68.2%	+0.2%	6.72

Measured with hyperfine --warmup 5 --runs 50 on Linux
Gate: PR vs HEAD main (threshold: 10%). BCR is shown only as a historical baseline.
Build time: cold bazel build //:bench with isolated output base, no disk cache.

sys.path quality

Version	sys.path entries	distinct site-packages roots	duplicate realpaths
BCR 1.11.7 (baseline)	6	1	0
HEAD main	7	2	0
This PR	7	2	0

sys.path quality measured by bench_syspath inside the assembled venv. Duplicate realpaths indicate symlink redundancy; many distinct site-packages roots suggest an inefficient venv layout.

Bazel analysis benchmark

Version	Mean (ms)	Median (ms)	± stddev	vs BCR	vs main	Packages	Targets
BCR 2.0.0-alpha.4 (baseline)	10606.782	10581.693	±119.842	—	—	101	301
HEAD main	9782.725	9747.359	±147.612	-7.8%	—	101	301
This PR	9771.607	9771.821	±129.267	-7.9%	-0.1%	101	301

Measured with hyperfine --warmup 1 --runs 10 on Linux
Gate: PR vs HEAD main (threshold: 10%). BCR is shown only as a historical baseline.
Command: cold bazel build --nobuild //workspace/... with isolated output base, no disk cache.

Auxiliary metrics

Version	Loaded packages	Configured targets
BCR 2.0.0-alpha.4 (baseline)	101	301
HEAD main	101	301
This PR	101	301