Bump tokenSupportVersion from 5.0.39 to 6.0.3

Bumps `tokenSupportVersion` from 5.0.39 to 6.0.3.

Updates `no.nav.security:token-validation-spring` from 5.0.39 to 6.0.3
- [Release notes](https://github.com/navikt/token-support/releases)
- [Commits](navikt/token-support@5.0.39...6.0.3)

Updates `no.nav.security:token-client-spring` from 5.0.39 to 6.0.3
- [Release notes](https://github.com/navikt/token-support/releases)
- [Commits](navikt/token-support@5.0.39...6.0.3)

Updates `no.nav.security:token-validation-spring-test` from 5.0.39 to 6.0.3
- [Release notes](https://github.com/navikt/token-support/releases)
- [Commits](navikt/token-support@5.0.39...6.0.3)

---
updated-dependencies:
- dependency-name: no.nav.security:token-validation-spring
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: no.nav.security:token-client-spring
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: no.nav.security:token-validation-spring-test
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

build.gradle.kts

@@ -26,7 +26,7 @@ repositories {
 val testContainersVersion = "2.0.3"
 val logstashLogbackEncoderVersion = "9.0"
 val kluentVersion = "1.73"
-val tokenSupportVersion = "5.0.39"
+val tokenSupportVersion = "6.0.3"
 val sykepengesoknadKafkaVersion = "2025.11.18-06.24-f860ace9"
 val kotestVersion = "6.1.3"