Bump javacopts from -source 7 -target 7 to -source 8 -target 8.

RELNOTES=targets now build with `-source 8 -target 8`
PiperOrigin-RevId: 607006811

api/BUILD

@@ -39,7 +39,7 @@ java_library(
                   STACK_GETTER_JAVA_LANG_ACCESS_IMPL_SRCS +
                   STACK_GETTER_COMMON_SRCS + CHECKS,
     ),
-    javacopts = ["-source 7 -target 7"],
+    javacopts = ["-source 8 -target 8"],
     tags = ["maven_coordinates=com.google.flogger:flogger:${project.version}"],
     visibility = ["//visibility:public"],
     exports = [":checks"],
@@ -77,7 +77,7 @@ STACK_GETTER_COMMON=$(location :stack_getter_common)
 CHECKS=$(location :checks)
 JAVABASE=$$PWD/$(JAVABASE)
 JAR=$$PWD/$(JAVABASE)/bin/jar
-$$JAVABASE/bin/javac -d $$TMPDIR -source 7 -target 7 -cp $${STACK_GETTER_COMMON}:$${CHECKS} -implicit:none \
+$$JAVABASE/bin/javac -d $$TMPDIR -source 8 -target 8 -cp $${STACK_GETTER_COMMON}:$${CHECKS} -implicit:none \
     $(location src/main/java/com/google/common/flogger/util/JavaLangAccessStackGetter.java)
 cd $$TMPDIR && $$JAR cf $$OUTPUT com/google/common/flogger/util/*StackGetter*.class
     """,
@@ -111,14 +111,14 @@ cd $$TMPDIR && $$JAR cf $$OUTPUT com/google/common/flogger/util/*StackGetter*.cl
 java_library(
     name = "stack_getter_common",
     srcs = STACK_GETTER_COMMON_SRCS,
-    javacopts = ["-source 7 -target 7"],
+    javacopts = ["-source 8 -target 8"],
     deps = [":checks"],
 )
 
 java_library(
     name = "checks",
     srcs = CHECKS,
-    javacopts = ["-source 7 -target 7"],
+    javacopts = ["-source 8 -target 8"],
     deps = [
         "@google_bazel_common//third_party/java/error_prone:annotations",
     ],
@@ -159,7 +159,7 @@ javadoc_library(
 java_library(
     name = "system_backend",
     srcs = SYSTEM_BACKEND_SRCS,
-    javacopts = ["-source 7 -target 7"],
+    javacopts = ["-source 8 -target 8"],
     tags = ["maven_coordinates=com.google.flogger:flogger-system-backend:${project.version}"],
     visibility = ["//visibility:public"],
     deps = [

log4j/BUILD

@@ -16,7 +16,7 @@ LOG4J_BACKEND_RESOURCES = glob(["src/main/resources/**"])
 java_library(
     name = "log4j_backend",
     srcs = LOG4J_BACKEND_SRCS,
-    javacopts = ["-source 7 -target 7"],
+    javacopts = ["-source 8 -target 8"],
     resources = LOG4J_BACKEND_RESOURCES,
     tags = ["maven_coordinates=com.google.flogger:flogger-log4j-backend:${project.version}"],
     deps = [

slf4j/BUILD

@@ -15,7 +15,7 @@ SLF4J_BACKEND_RESOURCES = glob(["src/main/resources/**"])
 java_library(
     name = "slf4j_backend",
     srcs = SLF4J_BACKEND_SRCS,
-    javacopts = ["-source 7 -target 7"],
+    javacopts = ["-source 8 -target 8"],
     resources = SLF4J_BACKEND_RESOURCES,
     tags = ["maven_coordinates=com.google.flogger:flogger-slf4j-backend:${project.version}"],
     deps = [