pin bokeh_fastapi to existing version

[pmeier]

In 7f850dc3c57a516d4c02656675e884a5b1ddd930 (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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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