[release/v1.48.x] Prepare release 1.48.0

[opentelemetrybot]

Prepare release 1.48.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.92%. Comparing base (2e4f9ed) to head (e820271).
Report is 1 commits behind head on release/v1.48.x.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/v1.48.x    #7187      +/-   ##
=====================================================
- Coverage              89.93%   89.92%   -0.01%     
+ Complexity              6663     6662       -1     
=====================================================
  Files                    750      750              
  Lines                  20126    20126              
  Branches                1973     1973              
=====================================================
- Hits                   18101    18099       -2     
- Misses                  1432     1434       +2     
  Partials                 593      593              

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