avm: Use rustc 1.79.0
when installing versions older than v0.31
#3315
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Problem
Installing Anchor from
avm
usingrustc >1.79
fails due to the problem mentioned in #3143.This was going to get solved after v0.31.0 release, however, external factors blocked the release (#3259) much longer than expected.
Summary of changes
Automatically switch to using
rustc 1.79.0
when installing Anchor versions older than0.31.0
.