Pin forked test JVMs to UTC

Datetime tests in the MSSQL suite (MovieSuite's `moviesShownBetween` and
computed-field cases) fail on a developer machine in a non-UTC time zone,
though they pass in CI. The MSSQL test codec encodes an OffsetDateTime
argument via a zone-naive `java.sql.Timestamp`, and mssql-jdbc binds it
into a DATETIMEOFFSET parameter using the ambient JVM time zone. On a
UTC+2 host the filter bound shifts by two hours, admitting an extra row.
Postgres is immune (native `Meta[OffsetDateTime]`); Oracle uses the same
codec but ojdbc binds it without the shift; CI runs in UTC so it never
surfaces there.

Author: phdoerfler

build.sbt

@@ -171,6 +171,13 @@ lazy val nativeSettings = Seq(
   )
 )
 
+// Pin the forked test JVM to UTC: mssql-jdbc binds a zone-naive java.sql.Timestamp using the
+// ambient JVM zone, so MSSQL datetime tests fail off-UTC unless pinned. Only meaningful where
+// Test / fork := true.
+lazy val utcTestSettings = Seq(
+  Test / javaOptions += "-Duser.timezone=UTC"
+)
+
 lazy val modules: List[CompositeProject] = List(
   core,
   circe,
@@ -272,6 +279,7 @@ lazy val doobiecore = project
   .disablePlugins(RevolverPlugin)
   .dependsOn(sqlcore.jvm % "test->test;compile->compile", circe.jvm)
   .settings(commonSettings)
+  .settings(utcTestSettings)
   .settings(
     name := "grackle-doobie-core",
     Test / fork := true,
@@ -291,6 +299,7 @@ lazy val doobiepg = project
     doobiecore % "test->test;compile->compile",
     sqlpg.jvm % "test->test;compile->compile")
   .settings(commonSettings)
+  .settings(utcTestSettings)
   .settings(
     name := "grackle-doobie-pg",
     Test / fork := true,
@@ -310,6 +319,7 @@ lazy val doobieoracle = project
   .disablePlugins(RevolverPlugin)
   .dependsOn(doobiecore % "test->test;compile->compile")
   .settings(commonSettings)
+  .settings(utcTestSettings)
   .settings(
     name := "grackle-doobie-oracle",
     Test / fork := true,
@@ -327,6 +337,7 @@ lazy val doobiemssql = project
   .disablePlugins(RevolverPlugin)
   .dependsOn(doobiecore % "test->test;compile->compile")
   .settings(commonSettings)
+  .settings(utcTestSettings)
   .settings(
     name := "grackle-doobie-mssql",
     Test / fork := true,
@@ -354,6 +365,7 @@ lazy val skunk = crossProject(JVMPlatform, JSPlatform, NativePlatform)
       "org.typelevel" %% "log4cats-core" % log4catsVersion
     )
   )
+  .jvmSettings(utcTestSettings)
   .jvmSettings(
     Test / fork := true,
     Test / testOptions += Tests.Setup(_ =>