Configurable price format + build/dependency updates

[md5sha256]

Configurable price format

Replaces the hardcoded NumberFormat.getCurrencyInstance() in PostOfficeMenu with a price-format-pattern setting under post-settings, so the currency symbol (and grouping/decimal style) can be changed via config.

post-settings:
  post-price: 0.50
  price-format-pattern: '$#,##0.00'

It is a standard java.text.DecimalFormat pattern, so any literal text around the number is kept verbatim: #,##0.00 credits, and so on.

• Falls back to $#,##0.00 when unset or empty, so existing configs are unaffected.
• Uses Locale.ROOT symbols so output does not shift with the server JVM locale.
• An invalid pattern throws at format time rather than at config load, worth tightening later if that matters.

Version bumped 1.0.1-SNAPSHOT -> 1.1.0-SNAPSHOT (new backward-compatible config option).

Build / dependency updates

Gradle wrapper 9.0 -> 9.6.1, shadow 9.3.1 -> 9.6.1, run-paper 2.3.0 -> 3.0.2.

Dependency	From	To
VaultAPI	1.7	1.7.1
mariadb-java-client	3.4.0	3.5.10
HikariCP	5.1.0	7.1.0
configurate-yaml / -gson	4.1.2	4.2.0
cloud-paper	2.0.0-beta.10	2.0.0
cloud-annotations	2.0.0	2.1.0
junit-bom	5.10.2	6.1.2

The mariadb and HikariCP versions in plugin.yml libraries: were updated to match. HikariCP 7.x requires Java 17+, which is fine against the Java 21 target.

paper-api is deliberately left at 1.21.8-R0.1-SNAPSHOT.

junit-vintage-engine was swapped for junit-platform-launcher: JUnit 6 needs the launcher on the test runtime classpath, and there are no JUnit 4 tests. Happy to restore vintage if you want it kept for future use.

de.themoep:inventorygui:1.6.1-SNAPSHOT was left alone; the version check could not resolve metadata for it.

Testing

./gradlew build passes, TestMariaSchema (1 test) passes, shadowJar produces the relocated jar.

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