github-actions: fix codecov for unittests

Don't overwrite ut coverage with later tests.

.github/workflows/builds.yml

@@ -1517,11 +1517,11 @@ jobs:
       - run: ./src/suricata --list-keywords -l /tmp
         env:
           LLVM_PROFILE_FILE: "/tmp/lk.profraw"
-      - run: llvm-profdata-14 merge -o ut.profdata /tmp/lk.profraw
+      - run: llvm-profdata-14 merge -o lk.profdata /tmp/lk.profraw
       - run: ./src/suricata --list-app-layer-protos -l /tmp
         env:
           LLVM_PROFILE_FILE: "/tmp/la.profraw"
-      - run: llvm-profdata-14 merge -o ut.profdata /tmp/la.profraw
+      - run: llvm-profdata-14 merge -o la.profdata /tmp/la.profraw
       - run: llvm-cov-14 show ./src/suricata -instr-profile=ut.profdata --show-instantiations --ignore-filename-regex="^/root/.*" > coverage.txt
       - run: |
           cd rust