fix: lake: pin mathlib in new/init to toolchain
#11063
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This PR changes the
mathandmath-laxtemplates forlake newandlake initto use the version of Mathlib corresponding to the current Lean toolchain. Thus,lake +x.y.z new <pkg> mathwill use the Mathlib for Leanx.y.z. On the other hand,lake updateon such packages will no longer update Mathlib automatically. Users will need to change the Mathlib revision in the configuration file before updating.This change was inspired by a discussion on the community Zulip.