chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/.github/APPROVED_CONTRIBUTORS

@@ -389,3 +389,19 @@ y-nk pr
 edverma pr
 
 Charlie0113-T pr
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+RedBeard0531 pr
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+metaist pr
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+jsanter27 pr
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+philfreo pr
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+adawalli pr
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+btkostner pr
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+Jay-Madden issue
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+lalyos pr