Excavator: Upgrade dependencies (#246)

Co-authored-by: svc-excavator-bot <svc-excavator-bot@palantir.com>

Author: svc-excavator-bot

versions.lock

@@ -5,8 +5,8 @@ com.fasterxml.jackson.core:jackson-databind:2.11.0 (3 constraints: f832eadf)
 com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.11.0 (1 constraints: 3605323b)
 com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.11.0 (1 constraints: 3605323b)
 org.freemarker:freemarker:2.3.30 (2 constraints: 5b136759)
-org.immutables:serial:2.8.7 (1 constraints: 13051436)
-org.immutables:value:2.8.7 (1 constraints: 13051436)
+org.immutables:serial:2.8.8 (1 constraints: 14051536)
+org.immutables:value:2.8.8 (1 constraints: 14051536)
 org.jboss:jboss-dmr:1.2.0.Final (1 constraints: 710a5ab9)
 org.revapi:revapi:0.11.1 (4 constraints: 8532f166)
 org.revapi:revapi-basic-features:0.8.1 (1 constraints: 0b050436)
@@ -28,7 +28,7 @@ junit:junit:4.13 (2 constraints: 541d390d)
 net.bytebuddy:byte-buddy:1.10.5 (1 constraints: 410b37de)
 net.bytebuddy:byte-buddy-agent:1.10.5 (1 constraints: 410b37de)
 org.apiguardian:apiguardian-api:1.1.0 (6 constraints: 7d64a5c6)
-org.assertj:assertj-core:3.16.0 (1 constraints: 3c05473b)
+org.assertj:assertj-core:3.16.1 (1 constraints: 3d05483b)
 org.codehaus.mojo:animal-sniffer-annotations:1.14 (1 constraints: ea09d5aa)
 org.hamcrest:hamcrest-core:1.3 (1 constraints: cc05fe3f)
 org.junit:junit-bom:5.6.2 (1 constraints: 0f051836)

versions.props

@@ -5,7 +5,7 @@ org.revapi:revapi-java = 0.19.1
 org.revapi:revapi-reporter-text = 0.10.1
 org.freemarker:freemarker = 2.3.30
 com.google.guava:guava = 23.1-jre
-org.immutables:* = 2.8.7
+org.immutables:* = 2.8.8
 com.fasterxml.jackson.*:jackson-* = 2.11.0
 org.mockito:mockito-core = 3.3.3
-org.assertj:assertj-core = 3.16.0
+org.assertj:assertj-core = 3.16.1