Move to io.opentelemetry.semconv:opentelemetry-semconv

[`io.opentelemetry:opentelemetry-semconv`](https://search.maven.org/artifact/io.opentelemetry/opentelemetry-semconv)
was moved to [`io.opentelemetry.semconv:opentelemetry-semconv`](https://search.maven.org/artifact/io.opentelemetry.semconv/opentelemetry-semconv)
and the former [will be deprecated](open-telemetry/opentelemetry-java#5786).

Author: Mahoney

.sdkmanrc

@@ -0,0 +1 @@
+java=8.0.312-tem

hooks/open-telemetry/pom.xml

@@ -39,9 +39,9 @@
 
     <dependencies>
         <dependency>
-            <groupId>io.opentelemetry</groupId>
-            <artifactId>opentelemetry-semconv</artifactId>
-            <version>1.30.1-alpha</version>
+            <groupId>io.opentelemetry.semconv</groupId>
+            <artifactId>opentelemetry-semconv-incubating</artifactId>
+            <version>1.28.0-alpha</version>
         </dependency>
 
         <dependency>

hooks/open-telemetry/src/main/java/dev/openfeature/contrib/hooks/otel/OTelCommons.java

@@ -1,16 +1,19 @@
 package dev.openfeature.contrib.hooks.otel;
 
 import io.opentelemetry.api.common.AttributeKey;
-import io.opentelemetry.semconv.trace.attributes.SemanticAttributes;
+
+import static io.opentelemetry.semconv.incubating.FeatureFlagIncubatingAttributes.FEATURE_FLAG_KEY;
+import static io.opentelemetry.semconv.incubating.FeatureFlagIncubatingAttributes.FEATURE_FLAG_PROVIDER_NAME;
+import static io.opentelemetry.semconv.incubating.FeatureFlagIncubatingAttributes.FEATURE_FLAG_VARIANT;
 
 class OTelCommons {
     // Define semantic conventions
     // Refer - https://opentelemetry.io/docs/specs/otel/logs/semantic_conventions/feature-flags/
     static final String EVENT_NAME = "feature_flag";
 
-    static final AttributeKey<String> flagKeyAttributeKey = SemanticAttributes.FEATURE_FLAG_KEY;
-    static final AttributeKey<String> providerNameAttributeKey = SemanticAttributes.FEATURE_FLAG_PROVIDER_NAME;
-    static final AttributeKey<String> variantAttributeKey = SemanticAttributes.FEATURE_FLAG_VARIANT;
+    static final AttributeKey<String> flagKeyAttributeKey = FEATURE_FLAG_KEY;
+    static final AttributeKey<String> providerNameAttributeKey = FEATURE_FLAG_PROVIDER_NAME;
+    static final AttributeKey<String> variantAttributeKey = FEATURE_FLAG_VARIANT;
 
     // Define non convention attribute keys
     static final String REASON_KEY = "reason";