Raise respdiff third-party and recent-named disagreement thresholds

The third-party comparison is right at the 0.4 % threshold, making it
fail quite often. The current range of observed values ranges from
0.3-0.5 %. Raise the threshold to 0.5 %.

The recent-named comparison produces values ranging from 0.05 to 0.12 %,
but appears to be more sensitive to time of the day when the test runs.
Raise the threshold to 0.15 %.

Both results are stable within the specified ranges across the last
three releases in both main and bind-9.20 series.

(cherry picked from commit a8413fa94c)

.gitlab-ci.yml

@@ -2560,7 +2560,7 @@ respdiff-third-party:
   variables:
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON} -Og"
-    MAX_DISAGREEMENTS_PERCENTAGE: "0.4"
+    MAX_DISAGREEMENTS_PERCENTAGE: "0.5"
   script:
     - bash respdiff.sh -s third_party -q "${PWD}/100k_mixed.txt" -c 1 -w "${PWD}/rspworkdir" -r "${PWD}/respdiff" "${CI_PROJECT_DIR}"
     - cd ../.. && make clean >/dev/null 2>&1
@@ -2588,7 +2588,7 @@ respdiff:recent-named:
   variables:
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON} -Og -DISC_TRACK_PTHREADS_OBJECTS"
-    MAX_DISAGREEMENTS_PERCENTAGE: "0.1"
+    MAX_DISAGREEMENTS_PERCENTAGE: "0.15"
 
 # Performance tests