go: Bump dependency on go1.18 and go-gitlab v0.115.0

Marco Trevisanrequested to merge
3v1n0/issue-bot:bump-go-and-libs into main

Go could be bumped to even newer versions, but I just went to the minimum needed to get newer that was enough to get go-gitlab to work

Closes: #27

Edited by Marco Trevisan

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