Temporarily disable python precompilation for py3.13

The precompilation logic assumes that the source tree matches the python
prebuilts, which is not necessarily true. This very much breaks during
major version upgrades, so just disable precompilation temporarily while
we generate new prebuilts.

Bug: 388344853
Test: treehugger
Change-Id: I8d412c5cc112566d1bdad1f03ade606331dacb02