fix: verify params nullable

[CAMOBAP]

No description provided.

[github-actions]

Benchmark report:

Test name	Time ms. (median)	Allocations (median)
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleVerification	+506.61	-2
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleVerificationColdRun	+677.02	+201
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleSetup	+10.04	+194
com.hcaptcha.sdk.HCaptchaDebugInfoTest.EMULATOR_UNLOCKED_benchmarkDebugInfo	+13.46	-5592
com.hcaptcha.sdk.HCaptchaDebugInfoTest.EMULATOR_UNLOCKED_benchmarkDebugSys	+37.79	-20

[github-actions]

Diffuse report:

OLD: sdk-main.aar
NEW: sdk-pr.aar

 AAR      │ old       │ new       │ diff  
──────────┼───────────┼───────────┼───────
      jar │  58.6 KiB │  58.6 KiB │ -49 B 
 manifest │     411 B │     411 B │   0 B 
      res │  78.2 KiB │  78.2 KiB │   0 B 
    other │     989 B │     989 B │   0 B 
──────────┼───────────┼───────────┼───────
    total │ 138.2 KiB │ 138.2 KiB │ -49 B 

 JAR     │ old │ new │ diff       
─────────┼─────┼─────┼────────────
 classes │  38 │  38 │  0 (+0 -0) 
 methods │ 556 │ 556 │  0 (+0 -0) 
  fields │ 174 │ 173 │ -1 (+0 -1)

AAR

 size     │ diff  │ path          
──────────┼───────┼───────────────
 58.6 KiB │ -49 B │ ∆ classes.jar 
──────────┼───────┼───────────────
 58.6 KiB │ -49 B │ (total)

JAR

FIELDS:

   old │ new │ diff       
  ─────┼─────┼────────────
   174 │ 173 │ -1 (+0 -1) 
  
  - com.hcaptcha.sdk.HCaptchaWebViewHelper verifyParams: HCaptchaVerifyParams