Bump foreman from 0.88.1 to 0.90.0 in /demo (#3607)

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Author: dependabot[bot]

demo/Gemfile.lock

@@ -104,7 +104,8 @@ GEM
     ffi-compiler (1.3.2)
       ffi (>= 1.15.5)
       rake
-    foreman (0.88.1)
+    foreman (0.90.0)
+      thor (~> 1.4)
     gli (2.22.2)
       ostruct
     google-cloud-env (2.2.1)