Update gradle.starter to v0.68.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.starter.library.kotlin	0.67.0 -> 0.68.0
com.starter.versioning	0.67.0 -> 0.68.0
com.starter.config	0.67.0 -> 0.68.0

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[github-actions]

Jar size:

Jar size change: +3.0B (3.1MiB -> 3.1MiB)

Diffuse output:

OLD: diffuse-source-file
NEW: pull-request-artifact.jar

       │         compressed         │         uncompressed         
       ├──────────┬──────────┬──────┼───────────┬───────────┬──────
 JAR   │ old      │ new      │ diff │ old       │ new       │ diff 
───────┼──────────┼──────────┼──────┼───────────┼───────────┼──────
 class │ 55.2 KiB │ 55.2 KiB │ +3 B │ 117.5 KiB │ 117.5 KiB │  0 B 
 other │    3 MiB │    3 MiB │  0 B │   6.4 MiB │   6.4 MiB │  0 B 
───────┼──────────┼──────────┼──────┼───────────┼───────────┼──────
 total │  3.1 MiB │  3.1 MiB │ +3 B │   6.5 MiB │   6.5 MiB │  0 B 

 CLASSES │ old │ new │ diff      
─────────┼─────┼─────┼───────────
 classes │  24 │  24 │ 0 (+0 -0) 
 methods │ 630 │ 630 │ 0 (+0 -0) 
  fields │  67 │  67 │ 0 (+0 -0)

JAR

   compressed   │  uncompressed   │                                                      
─────────┬──────┼──────────┬──────┤                                                      
 size    │ diff │ size     │ diff │ path                                                 
─────────┼──────┼──────────┼──────┼──────────────────────────────────────────────────────
 5.7 KiB │ +3 B │ 11.9 KiB │  0 B │ ∆ com/luciad/imageio/webp/WebPWriter_Companion.class 
─────────┼──────┼──────────┼──────┼──────────────────────────────────────────────────────
 5.7 KiB │ +3 B │ 11.9 KiB │  0 B │ (total)