Fix cross-compile pipeline job building for ARM 7 (#33830)

**Description:** <Describe what has changed.>
This PR fixes a small issue in the `cross-compile` pipeline job.
#23436
aimed to introduce a new specific matrix configuration that built for
linux/arm with ARMv7 but accidentally built all arm jobs with ARMv7 with
some magic of YAML and GitHub actions matrix definitions 😇

**Link to tracking Issue:**
#29542

**Testing:** not sure how to test, since this is just pipeline changes

**Documentation:** no docs added

Signed-off-by: Moritz Wiesinger <moritz.wiesinger@dynatrace.com>

.github/workflows/build-and-test.yml

@@ -480,8 +480,8 @@ jobs:
           - s390x
         include:
           - os: linux
-          - arch: arm
-          - arm: 7
+            arch: arm
+            arm: 7
         exclude:
           - os: darwin
             arch: 386