Excavator: Update conjure plugins and dependencies (#634)

versions.lock

@@ -16,9 +16,9 @@ com.google.errorprone:error_prone_annotations:2.26.1 (24 constraints: 1fa92637)
 com.google.guava:failureaccess:1.0.2 (1 constraints: 150ae2b4)
 com.google.guava:guava:33.1.0-jre (24 constraints: ced7f4ac)
 com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava (1 constraints: bd17c918)
-com.palantir.conjure.java:conjure-java-undertow-runtime:8.20.0 (1 constraints: 3c05573b)
-com.palantir.conjure.java:conjure-lib:8.20.0 (5 constraints: 9050932e)
-com.palantir.conjure.java:conjure-undertow-lib:8.20.0 (2 constraints: 9e1cd6c6)
+com.palantir.conjure.java:conjure-java-undertow-runtime:8.21.0 (1 constraints: 3d055a3b)
+com.palantir.conjure.java:conjure-lib:8.21.0 (5 constraints: 93506430)
+com.palantir.conjure.java:conjure-undertow-lib:8.21.0 (2 constraints: a01c1dc7)
 com.palantir.conjure.java.api:errors:2.52.0 (6 constraints: de7a2efb)
 com.palantir.conjure.java.api:ssl-config:2.52.0 (3 constraints: be39b306)
 com.palantir.conjure.java.runtime:conjure-java-jackson-optimizations:8.8.0 (1 constraints: 561c4888)

versions.props

@@ -2,7 +2,7 @@ com.fasterxml.jackson.core:jackson-databind = 2.16.1
 com.google.guava:guava = 33.1.0-jre
 com.netflix.feign:feign-*= 8.18.0
 com.palantir.conjure:conjure = 4.48.0
-com.palantir.conjure.java:* = 8.20.0
+com.palantir.conjure.java:* = 8.21.0
 com.palantir.conjure.java.api:test-utils = 2.52.0
 com.palantir.conjure.java.runtime:* = 8.8.0
 com.palantir.conjure.typescript:conjure-typescript = 5.5.0