Don't allow major updates of chai (#1168)

Major update breaks dependabot. Will leave until a later time when we
can properly migrate to the next major version of the various chai
dependencies.

#1167

Issue: #1136

Author: award999

.github/dependabot.yml

@@ -16,6 +16,8 @@ updates:
         update-types: ["version-update:semver-major"]
       - dependency-name: "@typescript-eslint/*"
         update-types: ["version-update:semver-major"]
+      - dependency-name: "*chai*"
+        update-types: ["version-update:semver-major"]
       - dependency-name: "@types/vscode"
     groups:
       all-dependencies: