Update skip after backport (#54450)

Now that #54161 is backported we can run its tests against nodes that
have the fix.

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

rest-api-spec/src/main/resources/rest-api-spec/test/search.aggregation/280_rare_terms.yml

@@ -364,8 +364,8 @@ setup:
 ---
 "avg_bucket":
   - skip:
-      version: " - 7.99.99"
-      reason: Fixed in 8.0.0 to be backported to 7.8.0
+      version: " - 7.7.99"
+      reason: Fixed in 7.8.0
   - do:
       indices.create:
           index: test

rest-api-spec/src/main/resources/rest-api-spec/test/search.aggregation/330_auto_date_histogram.yml

@@ -44,8 +44,8 @@ setup:
 ---
 "avg_bucket":
   - skip:
-      version: " - 7.99.99"
-      reason: Fixed in 8.0.0 to be backported to 7.8.0
+      version: " - 7.7.99"
+      reason: Fixed in 7.8.0
   - do:
       search:
         body:

rest-api-spec/src/main/resources/rest-api-spec/test/search.aggregation/340_geo_distance.yml

@@ -47,8 +47,8 @@ setup:
 ---
 "avg_bucket":
   - skip:
-      version: " - 7.99.99"
-      reason: Fixed in 8.0.0 to be backported to 7.8.0
+      version: " - 7.7.99"
+      reason: Fixed in 7.8.0
   - do:
       search:
         body:

rest-api-spec/src/main/resources/rest-api-spec/test/search.aggregation/40_range.yml

@@ -224,8 +224,8 @@ setup:
 ---
 "IP Range avg_bucket":
   - skip:
-      version: " - 7.99.99"
-      reason: Fixed in 8.0.0 to be backported to 7.8.0
+      version: " - 7.7.99"
+      reason: Fixed in 7.8.0
   - do:
       bulk:
         refresh: true