update template

Author: aryx

.github/pull_request_template.md

@@ -1,5 +1,5 @@
 - [ ] I ran `make setup && make` to update the generated code after editing a `.atd` file (TODO: have a CI check)
 - [ ] I made sure we're still backward compatible with old versions of the CLI.
       For example, the Semgrep backend need to still be able to *consume* data generated
-	  by Semgrep 1.17.0.
+	  by Semgrep 1.50.0.
       See https://atd.readthedocs.io/en/latest/atdgen-tutorial.html#smooth-protocol-upgrades