Prepare 0.26.0 release

Author: holzensp

docs/antora.yml

@@ -1,6 +1,6 @@
 name: main
 title: Main Project
-version: 0.26.0-dev
-prerelease: true
+version: 0.26.0
+prerelease: false
 nav:
 - nav.adoc

docs/modules/ROOT/partials/component-attributes.adoc

@@ -6,7 +6,7 @@
 :pkl-version-no-suffix: 0.26.0
 // tells whether pkl version corresponding to current git commit
 // is a release version (:is-release-version: '') or dev version (:!is-release-version:)
-:!is-release-version:
+:is-release-version: ''
 
 // the remaining attributes do not need to be updated regularly
 

pkl-core/src/main/java/org/pkl/core/runtime/VmLanguage.java

@@ -33,7 +33,7 @@
 @TruffleLanguage.Registration(
     id = "pkl",
     name = "Pkl",
-    version = "0.26.0-dev",
+    version = "0.26.0",
     characterMimeTypes = VmLanguage.MIME_TYPE,
     contextPolicy = ContextPolicy.SHARED)
 public final class VmLanguage extends TruffleLanguage<VmContext> {