deps: Update gapic-libraries-bom version to 1.76.0-rc1 (#2742)

Author: diegomarquezp

google-cloud-bigtable-deps-bom/pom.xml

@@ -68,7 +68,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>gapic-libraries-bom</artifactId>
-        <version>1.74.0</version>
+        <version>1.76.0-rc1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>