[clang] [z/OS][Clang] Raise minimum supported z/OS target level to 3.1 (PR #203580)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/lib/Driver/Driver.cpp clang/test/Preprocessor/zos-target.c --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 94248772d..8f189ea18 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -552,9 +552,7 @@ static void setZosTargetVersion(const Driver &D, llvm::Triple &Target,
                                 StringRef ArgTarget) {
 
   static bool BeSilent = false;
-  auto IsTooOldToBeSupported = [](int v, int r) -> bool {
-    return v < 3;
-  };
+  auto IsTooOldToBeSupported = [](int v, int r) -> bool { return v < 3; };
 
   /* expect CURRENT, zOSVnRn, or 0xnnnnnnnn */
   if (ArgTarget.equals_insensitive("CURRENT")) {

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https://github.com/llvm/llvm-project/pull/203580