fix: correctly set pulumi-kubernetes python dependency

[rquitales]

Proposed changes

When setting p-k as a python dependency for schemagen, we also need to include the == token to generate a valid pyproject.toml file.

Related issues (optional)

Related: pulumi/crd2pulumi#148

[blampe]

Ugh!!

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

Attention: Patch coverage is 53.33333% with 7 lines in your changes missing coverage. Please review.

Project coverage is 40.84%. Comparing base (7155e2e) to head (6e3c283).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
provider/pkg/gen/schema.go	0.00%	5 Missing ⚠️
provider/pkg/gen/typegen.go	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3210      +/-   ##
==========================================
+ Coverage   38.60%   40.84%   +2.23%     
==========================================
  Files          84       84              
  Lines        9866     9876      +10     
==========================================
+ Hits         3809     4034     +225     
+ Misses       5695     5459     -236     
- Partials      362      383      +21     

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