Excavator: Update conjure plugins and dependencies (#2724)

Author: svc-excavator-bot

versions.lock

@@ -24,8 +24,8 @@ com.google.j2objc:j2objc-annotations:2.8 (1 constraints: be09f5a0)
 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:7.20.0 (3 constraints: 5725a74d)
-com.palantir.conjure.java.api:errors:2.38.0 (3 constraints: 39256e4b)
+com.palantir.conjure.java:conjure-lib:7.21.0 (3 constraints: 5825074e)
+com.palantir.conjure.java.api:errors:2.38.0 (3 constraints: 3b25d04b)
 com.palantir.conjure.java.api:service-config:2.38.0 (3 constraints: ad286ce4)
 com.palantir.conjure.java.api:ssl-config:2.38.0 (2 constraints: 05183887)
 com.palantir.dialogue:dialogue-apache-hc5-client:3.98.0 (1 constraints: 46056d3b)

versions.props

@@ -4,8 +4,8 @@ com.google.code.findbugs:jsr305 = 3.0.2
 com.google.guava:guava = 32.1.3-jre
 com.netflix.concurrency-limits:* = 0.2.2
 com.netflix.feign:feign-*= 8.18.0
-com.palantir.conjure.java:* = 7.20.0
-com.palantir.conjure.java:conjure-lib = 7.20.0
+com.palantir.conjure.java:* = 7.21.0
+com.palantir.conjure.java:conjure-lib = 7.21.0
 com.palantir.conjure.java.api:* = 2.38.0
 com.palantir.conjure.verification:* = 0.19.0
 com.palantir.dialogue:* = 3.98.0