Update BITRISE_CLI_VERSION

[uny]

https://github.com/bitrise-io/bitrise/releases/download/1.21.0/bitrise-Linux-x86_64 no longer exists, so docker build -t envman . now fails.

Step 7/20 : RUN curl -L https://github.com/bitrise-io/bitrise/releases/download/$BITRISE_CLI_VERSION/bitrise-$(uname -s)-$(uname -m) > /usr/local/bin/bitrise
 ---> Using cache
 ---> 55f054895e88
Step 8/20 : RUN chmod +x /usr/local/bin/bitrise
 ---> Using cache
 ---> 63c62e357ec5
Step 9/20 : RUN ls /usr/local/bin
 ---> Running in 47b34fdef380
bitrise
Removing intermediate container 47b34fdef380
 ---> 6186ef22df8c
Step 10/20 : RUN bitrise setup
 ---> Running in 86c5f19dcb05
/usr/local/bin/bitrise: 1: /usr/local/bin/bitrise: Not: not found

[codecov-io]

Codecov Report

Merging #181 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #181   +/-   ##
=======================================
  Coverage   35.02%   35.02%           
=======================================
  Files          11       11           
  Lines         708      708           
=======================================
  Hits          248      248           
  Misses        418      418           
  Partials       42       42

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