Next dev version 1.8.0

[0xnm]

What does this PR do?

This change bumps dev version to 1.8.0, considering the upcoming 1.7.0 release.

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• [ ] Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #145 (1d88a04) into develop (e630ea8) will decrease coverage by 0.17%. The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop     #145      +/-   ##
=============================================
- Coverage      86.57%   86.40%   -0.17%     
+ Complexity       178      177       -1     
=============================================
  Files             21       21              
  Lines            581      581              
  Branches          75       75              
=============================================
- Hits             503      502       -1     
  Misses            49       49              
- Partials          29       30       +1     

Impacted Files	Coverage Δ
...m/datadog/gradle/plugin/internal/OkHttpUploader.kt	84.43% <ø> (ø)
...com/datadog/gradle/plugin/DdAndroidGradlePlugin.kt	74.14% <0.00%> (-0.86%)	:arrow_down: