Add @Deprecated to methods that are documented as deprecated [ci skip]

[habrahamsson-skanetrafiken]

Summary

Tiny PR that fixes some compiler warnings where methods are documented as deprecated but not annotated as such.

Bumping the serialization version id

Nope

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.24%. Comparing base (5db8d43) to head (9175a69).
Report is 33 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6560      +/-   ##
=============================================
- Coverage      70.25%   70.24%   -0.01%     
+ Complexity     18386    18384       -2     
=============================================
  Files           2088     2088              
  Lines          77417    77417              
  Branches        7840     7840              
=============================================
- Hits           54387    54384       -3     
- Misses         20262    20263       +1     
- Partials        2768     2770       +2     

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