update exoplayer to 2.11.7

[michaelknoch]

Type of change: dependency update

Motivation (current vs expected behavior)

• potentially fixes an ANR
• should smoothen play/pause/seek experience

Please check if the PR fulfills these requirements

• [ ] Self-review: I am confident this is the simplest and clearest way to achieve the expected behaviour
• [ ] There are no dependencies on other PRs or I have linked dependencies through Zenhub
• [ ] The commit messages are clean and understandable
• [ ] Tests for the changes have been added (for bug fixes / features)

[mouselangelo]

PS: we should also update the react-native expo player :)

[codecov[bot]]

Codecov Report

Merging #312 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #312   +/-   ##
=======================================
  Coverage   51.42%   51.42%           
=======================================
  Files          87       87           
  Lines        2872     2872           
=======================================
  Hits         1477     1477           
  Misses       1395     1395           

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