Rollup merge of rust-lang#77787 - jyn514:consistent-versions, r=spast…

…orino

Update `changelog-seen` in config.toml.example

This got out of sync when the version was bumped last time in rust-lang#77133

Long-term we may want to find an easier way to maintain this that
doesn't require bumping the version in three different places. Off the
top of my head I can't think of anything, though. It _is_ documented in src/bootstrap/README.md, although I don't know how many people read that.

r? @Mark-Simulacrum
cc @spastorino

config.toml.example

@@ -13,7 +13,7 @@
 # If it does not match the version that is currently running,
 # `x.py` will prompt you to update it and read the changelog.
 # See `src/bootstrap/CHANGELOG.md` for more information.
-changelog-seen = 1
+changelog-seen = 2
 
 # =============================================================================
 # Global Settings