CI: Check MSRV without git feature enabled

git2-rs MSRV policy is to only support latest stable rust (see
https://github.com/rust-lang/git2-rs#rust-version-requirements), so it
does not make sense to run our MSRV tests with git enabled.

tests/integration_tests.rs

@@ -987,6 +987,7 @@ fn header_full_binary() {
 }
 
 #[test]
+#[cfg(feature = "git")] // Expected output assumes git is enabled
 fn header_default() {
     bat()
         .arg("--paging=never")
@@ -1011,6 +1012,7 @@ fn header_default() {
 }
 
 #[test]
+#[cfg(feature = "git")] // Expected output assumes git is enabled
 fn header_default_is_default() {
     bat()
         .arg("--paging=never")
@@ -1373,6 +1375,7 @@ fn plain_mode_does_not_add_nonexisting_newline() {
 
 // Regression test for https://github.com/sharkdp/bat/issues/299
 #[test]
+#[cfg(feature = "git")] // Expected output assumes git is enabled
 fn grid_for_file_without_newline() {
     bat()
         .arg("--paging=never")

tests/snapshot_tests.rs

@@ -1,13 +1,13 @@
+#[cfg(feature = "git")]
 mod tester;
 
-use crate::tester::BatTester;
-
 macro_rules! snapshot_tests {
     ($($test_name: ident: $style: expr,)*) => {
         $(
             #[test]
+            #[cfg(feature = "git")]
             fn $test_name() {
-                let bat_tester = BatTester::default();
+                let bat_tester = tester::BatTester::default();
                 bat_tester.test_snapshot(stringify!($test_name), $style);
             }
         )*