Delete examples/.bazelversion

The version number is set to 7.1.0 and the contents of the example would never work on 7.x.

Our CI always sets a version which is why this not mattering, but it appears that if you hold it exactly right bazelisk will use this version if present, but fall back to latest bazel if not. Just deleting the file so we don't let it rot again.

PiperOrigin-RevId: 966558235
diff --git a/examples/.bazelversion b/examples/.bazelversion
deleted file mode 100644
index a3fcc71..0000000
--- a/examples/.bazelversion
+++ /dev/null
@@ -1 +0,0 @@
-7.1.0