Update Elixir to 1.14

[SimonLab]

• Use version 1.14 For elixir
• Update Dockerfile to allow the application to be deployed using the correct docker image with Elixir 1.14

see: https://github.com/dwyl/mvp/issues/183#issuecomment-1286003842

[codecov[bot]]

Codecov Report

Merging #187 (2aebf01) into main (4b73103) will decrease coverage by 1.35%. The diff coverage is n/a.

@@             Coverage Diff             @@
##              main     #187      +/-   ##
===========================================
- Coverage   100.00%   98.64%   -1.36%     
===========================================
  Files           13       13              
  Lines          221      221              
===========================================
- Hits           221      218       -3     
- Misses           0        3       +3     

Impacted Files	Coverage Δ
lib/app_web/live/app_live.ex	96.10% <0.00%> (-3.90%)	:arrow_down:

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more