Update plugin spring-nullability to v0.0.13

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.spring.nullability	0.0.11 → 0.0.13

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Release Notes

spring-gradle-plugins/nullability-plugin (io.spring.nullability)

v0.0.13

🔨 Dependency Upgrades

• Upgrade to Error Prone 2.49.0 #​39
• Upgrade to Gradle Error Prone Plugin 5.1.0 #​36
• Upgrade to NullAway 0.13.2 #​40

v0.0.12

📔 Documentation

• Correct supported versions of Gradle in the README #​35

🔨 Dependency Upgrades

• Upgrade to Error Prone 2.47.0 #​34
• Upgrade to Gradle Error Prone Plugin 5.0.0 #​33

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.76%. Comparing base (b7c82cc) to head (0e5ff77).
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #128   +/-   ##
=========================================
  Coverage     90.76%   90.76%           
  Complexity      265      265           
=========================================
  Files           118      118           
  Lines           671      671           
  Branches         60       60           
=========================================
  Hits            609      609           
  Misses           47       47           
  Partials         15       15           

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