Bump MySQL test version from 8.0.39 to 8.0.42 (#42122)

Updates MySQL version references from 8.0.39 to 8.0.42 in GitHub Actions
workflow test matrices to match current Aurora version as of #42120.

---------

Co-authored-by: anthropic-code-agent[bot] <242468646+Claude@users.noreply.github.com>
Co-authored-by: iansltx <472804+iansltx@users.noreply.github.com>
Co-authored-by: Ian Littman <iansltx@gmail.com>

.github/workflows/test-go-activity.yaml

@@ -68,7 +68,7 @@ jobs:
     if: github.event_name == 'schedule'
     strategy:
       matrix:
-        mysql: ["mysql:8.0.39", "mysql:8.4.8"]
+        mysql: ["mysql:8.0.42", "mysql:8.4.8"]
     uses: ./.github/workflows/test-go-suite.yaml
     with:
       suite: activity

.github/workflows/test-go.yaml

@@ -87,7 +87,7 @@ jobs:
     strategy:
       matrix:
         suite: ["integration-core", "integration-enterprise", "integration-mdm", "fleetctl", "main", "mysql", "service", "vuln"]
-        mysql: ["mysql:8.0.39", "mysql:8.4.8"]
+        mysql: ["mysql:8.0.42", "mysql:8.4.8"]
     uses: ./.github/workflows/test-go-suite.yaml
     with:
       suite: ${{ matrix.suite }}

changes/bump-mysql

@@ -1 +1 @@
-* Revised which versions Fleet tests MySQL against to 9.5.0 (unchanged), 8.4.8, 8.0.44, and 8.0.39, 8.0.44.
+* Revised which versions Fleet tests MySQL against to 9.5.0 (unchanged), 8.4.8, 8.0.39, and 8.0.42.

changes/bump-mysql-8.0.42

@@ -0,0 +1 @@
+* Revised which versions Fleet tests MySQL against to remove 8.0.39 and add 8.0.42.

docs/Get started/FAQ.md

@@ -152,7 +152,7 @@ See the ["How to uninstall fleetd" guide](https://fleetdm.com/guides/how-to-unin
 
 ### What MySQL versions are supported?
 
-Fleet is tested with MySQL 8.0.34, 8.4.8, and 9.5.0 (9.6.0 is currently incompatible). Newer versions of MySQL 8 typically work well. AWS Aurora requires at least version 3.08.2. Please avoid using MariaDB or other MySQL variants that are not officially supported. Compatibility issues have been identified with MySQL variants, and these may not be addressed in future Fleet releases.
+Fleet is tested with MySQL 8.0.44, 8.4.8, and 9.5.0 (9.6.0 is currently incompatible). Newer versions of MySQL 8 typically work well. AWS Aurora requires at least version 3.10.3. Please avoid using MariaDB or other MySQL variants that are not officially supported. Compatibility issues have been identified with MySQL variants, and these may not be addressed in future Fleet releases.
 
 ### What version of the Mac Admins osquery extension is supported?