pin bokeh_fastapi to existing version

[pmeier]

In 7f850dc (Cc @philippjfr) the dependency was upped to bokeh_fastapi>=0.1.2. However, as of right now, the latest release is 0.1.1:

Meaning, pip install panel[fastapi] currently fails as pip cannot find a version that satisfies the constraints.

This PR drops the pin back down to bokeh_fastapi>=0.1.1, which is likely what was intended in the first place.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.37%. Comparing base (951f620) to head (8665d1d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7495      +/-   ##
==========================================
- Coverage   82.37%   82.37%   -0.01%     
==========================================
  Files         339      339              
  Lines       50995    50995              
==========================================
- Hits        42008    42007       -1     
- Misses       8987     8988       +1     

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