Excavator: Update conjure plugins and dependencies (#2867)

Author: svc-excavator-bot

versions.lock

@@ -24,7 +24,7 @@ com.google.j2objc:j2objc-annotations:3.0.0 (1 constraints: 150aeab4)
 com.netflix.concurrency-limits:concurrency-limits-core:0.2.2 (1 constraints: 0605f335)
 com.netflix.feign:feign-core:8.18.0 (2 constraints: 1213df52)
 com.netflix.feign:feign-jackson:8.18.0 (1 constraints: 43056b3b)
-com.palantir.conjure.java:conjure-lib:8.14.0 (3 constraints: 5f25974f)
+com.palantir.conjure.java:conjure-lib:8.15.0 (3 constraints: 6025f74f)
 com.palantir.conjure.java.api:errors:2.50.0 (3 constraints: 29255e48)
 com.palantir.conjure.java.api:service-config:2.50.0 (3 constraints: 9b28c4e0)
 com.palantir.conjure.java.api:ssl-config:2.50.0 (2 constraints: f917d485)

versions.props

@@ -5,8 +5,8 @@ com.google.code.findbugs:jsr305 = 3.0.2
 com.google.guava:guava = 33.1.0-jre
 com.netflix.concurrency-limits:* = 0.2.2
 com.netflix.feign:feign-*= 8.18.0
-com.palantir.conjure.java:* = 8.14.0
-com.palantir.conjure.java:conjure-lib = 8.14.0
+com.palantir.conjure.java:* = 8.15.0
+com.palantir.conjure.java:conjure-lib = 8.15.0
 com.palantir.conjure.java.api:* = 2.50.0
 com.palantir.conjure.verification:* = 0.19.0
 com.palantir.dialogue:* = 3.125.0