Exception in plugin .env file support

Currently I have to disable the .env file support plugin (2021.3.0.212) in IntelliJ
`IntelliJ IDEA 2021.2.3 (Ultimate Edition)
Build #IU-212.5457.46, built on October 12, 2021`

due to an exception on startup. A compatibility issue? In the plugins tab it doesn't say anything about being incompatible with this IntelliJ version.

Maybe this can be fixed.

Here is the callstack:
`java.lang.NoClassDefFoundError: org/jetbrains/plugins/ruby/ruby/lang/psi/basicTypes/stringLiterals/RStringLiteral
at ru.adelf.idea.dotenv.ruby.RubyEnvCompletionProvider.getStringLiteral(RubyEnvCompletionProvider.java:66)
at ru.adelf.idea.dotenv.ruby.RubyEnvCompletionProvider.getGotoDeclarationTargets(RubyEnvCompletionProvider.java:53)
at com.intellij.codeInsight.navigation.impl.GtdProvidersKt.fromGTDProvidersInner(gtdProviders.kt:31)
at com.intellij.codeInsight.navigation.impl.GtdProvidersKt.access$fromGTDProvidersInner(gtdProviders.kt:1)
at com.intellij.codeInsight.navigation.impl.GtdProvidersKt$fromGTDProviders$1.invoke(gtdProviders.kt:18)
at com.intellij.codeInsight.navigation.impl.GtdProvidersKt$fromGTDProviders$1.invoke(gtdProviders.kt)
at com.intellij.codeInsight.navigation.impl.CommonKt.processInjectionThenHost(common.kt:26)
at com.intellij.codeInsight.navigation.impl.GtdProvidersKt.fromGTDProviders(gtdProviders.kt:17)
at com.intellij.codeInsight.navigation.actions.GotoDeclarationOrUsageHandler2.gotoDeclarationOrUsages(GotoDeclarationOrUsageHandler2.kt:29)
at com.intellij.codeInsight.navigation.actions.GotoDeclarationOrUsageHandler2.getCtrlMouseInfo(GotoDeclarationOrUsageHandler2.kt:35)
at com.intellij.codeInsight.navigation.actions.GotoDeclarationAction.getCtrlMouseInfo(GotoDeclarationAction.java:94)
at com.intellij.codeInsight.navigation.CtrlMouseHandler$TooltipProvider.doExecute(CtrlMouseHandler.java:392)
at com.intellij.codeInsight.navigation.CtrlMouseHandler$TooltipProvider.lambda$execute$0(CtrlMouseHandler.java:370)
at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.insideReadAction(NonBlockingReadActionImpl.java:521)
at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$attemptComputation$3(NonBlockingReadActionImpl.java:486)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1078)
at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runInReadActionWithWriteActionPriority$0(ProgressIndicatorUtils.java:78)
at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runActionAndCancelBeforeWrite(ProgressIndicatorUtils.java:161)
at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runWithWriteActionPriority$1(ProgressIndicatorUtils.java:118)
at com.intellij.openapi.progress.ProgressManager.lambda$runProcess$0(ProgressManager.java:57)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:183)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:705)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:647)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:63)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:170)
at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:57)
at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runWithWriteActionPriority(ProgressIndicatorUtils.java:115)
at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runInReadActionWithWriteActionPriority(ProgressIndicatorUtils.java:78)
at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.attemptComputation(NonBlockingReadActionImpl.java:486)
at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$transferToBgThread$1(NonBlockingReadActionImpl.java:407)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
at java.base/java.lang.Thread.run(Thread.java:829)`