Update Bazel to 1.1.0 and replace bazelisk by a direct download

This pins the version and avoids the need to redownload the binary
each time the container is recreated.

The .bazelversion file was bazelisk-specific and is no longer needed.

Test Plan:
Rebuilt the container, ran `scripts:launch`.

Modifying the checksum caused to build to fail.

X-Origin-Diff: phab/D211
GitOrigin-RevId: ec9ec2b97c6555a676f6444ac3923fad34b2cd16
diff --git a/WORKSPACE b/WORKSPACE
index 59a53fd..4305109 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -22,7 +22,7 @@
 
 load("@bazel_skylib//lib:versions.bzl", "versions")
 
-versions.check(minimum_bazel_version = "1.0.0")
+versions.check(minimum_bazel_version = "1.1.0")
 
 # Go and Gazelle