community/py3-validate-pyproject: fix checksum
It seems the only change is this:
--- validate-pyproject-0.15.old/.git_archival.txt
+++ validate-pyproject-0.15/.git_archival.txt
@@ -1,4 +1,4 @@
node: 57fe0d1748f3ace002f5599289f5a53330555b20
node-date: 2023-10-12T18:19:24+01:00
describe-name: v0.15
-ref-names: HEAD -> main, tag: v0.15
+ref-names: tag: v0.15