Add rebar3 installs for Elixir 1.14.5 & 1.15.0-rc.0

[wojtekmach]

It's already published but need to purge fastly cache:

~/src/hex[wm-rebar-3.22.0]% curl "https://builds.hex.pm/installs/rebar3-1.x.csv"
3.13.3,26636017b3daa3b85509685383375e3e1e6734cad0e4f56b735d142b76d0fe88bb942d13dc10ce080e49d019fa52d42d29e923164c9ab86c6ace001f59ddeedb,1.0.0
3.15.2,af8b5d871fec083dc48669ada700ca6ab19f433d7ae0424e36d9f2b5e3189c06a11994f4c5324f59721b49da03fed50da323795908e8166c1ae5a5ad2bc53d30,1.11.4
3.15.2,dc559ace623406453c424debbcccb3eca3d40403920f6be0e240f5ec7e8f2836886fd3a3d6355e06d924781143f1275c35067e8ad7d1fe0995e35e74dedc6f17,1.13.0

# vs
~/src/hex[wm-rebar-3.22.0]% curl "https://builds.hex.pm/installs/rebar3-1.x.csv?0"
3.13.3,db2fd852735e3e183959c3716773cbdf221ef766c67ac05b76eab1ac44f46ae253a9b56d84aa6f0bf04a0ad431eec0316be8d2607399913ff2849456d99fd428,1.0.0
3.15.2,72bf50fb01231b63767fc33e121c245c5a12119eb485accadc49db4d0960a2e8bd4c12519c587e7f91ecfb923cc149987ef8237c81781896c2b4cac4edd38c15,1.11.4
3.15.2,cc0f2543606c31885eb8487212ea9b1673eb6a603fe90c7f7dd225ba5f859dc4a3e3867112c2e0a33134b6785f702b8fefbf57d44e0dcfa3ec67938cde0eb73a,1.13.0
3.22.0,9fc711bdc2fa3d55de4c564c7a0a26fef83a67ab179ef588f61ad196d30eb8e7c3144f756f45a942c4cc6bbbbb135cf60851c888ef02c081b58ecbb10f6b3f59,1.14.5
3.22.0,79127154400fd0e9b06b8c7015be84b755efa2301f79be314168aea5702a32dad1cb335b0f66bbe9a1b1aa7a4f5c2479d4bb90c1dbb77f41da42af87819f93a5,1.15.0-rc.0

Eric, could you help with automatic that?

[wojtekmach]

I've manually purged cache using Fastly UI for now.