Revert "NO-JIRA Workaround Travis CI package installation issues (#311)"

[jiridanek]

The workaround has outlived its usefulness and is now causing build failures.

This reverts commit 06c7e64

[codecov-commenter]

Codecov Report

Merging #372 (c6b5e48) into main (d1bcaa3) will increase coverage by 20.04%.
The diff coverage is n/a.

❗ Current head c6b5e48 differs from pull request most recent head 69a6e4b. Consider uploading reports for the commit 69a6e4b to get more accurate results

@@             Coverage Diff             @@
##             main     #372       +/-   ##
===========================================
+ Coverage   68.29%   88.34%   +20.04%     
===========================================
  Files         367       47      -320     
  Lines       73216     2394    -70822     
===========================================
- Hits        50005     2115    -47890     
+ Misses      23211      279    -22932     

Impacted Files	Coverage Δ
cpp/src/duration.cpp
build/c/src/core/frame_generators.c
cpp/src/sender.cpp
cpp/src/url_test.cpp
c/tests/thread.h
cpp/src/proton_bits.hpp
c/src/extra/url.c
c/src/core/autodetect.c
...on/test_PROTON_1800_syncrequestresponse_fd_leak.py
cpp/src/scalar_test.hpp
... and 310 more

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