Update MSRV to 1.58

The rust version 1.53 was supported in OpenSUSE Leap 15.3 which
has reached EOL. The new MSRV 1.58 is decided after looking into
distributions that are of interest.

Signed-off-by: Gowtham Suresh Kumar <[email protected]>

Author: gowthamsk-arm

ci.sh

@@ -326,15 +326,15 @@ if [ "$PROVIDER_NAME" = "cargo-check" ]; then
     # and an old Rust compiler.
     # The old Rust compiler version is found by manually checking the oldest Rust version of all
     # Linux distributions that we support:
-    # - Fedora 33 and more recent releases
-    # - RHEL-8
+    # - Fedora 36 and more recent releases
+    # - RHEL-9 (intend to support in the future)
     # - openSUSE Tumbleweed
-    # - openSUSE Leap 15.3
-    # The oldest is currently in openSUSE Leap 15.3 and is 1.53.0.
+    # - openSUSE Leap 15.4
+    # The oldest is currently in RHEL9, is 1.58.1.
 
-    rustup toolchain install 1.53.0
-    # The "jwt-svid-authenticator" can not be compiled on 1.53.0
-    RUST_BACKTRACE=1 cargo +1.53.0 check --release --features=all-providers,direct-authenticator,unix-peer-credentials-authenticator
+    rustup toolchain install 1.58.1
+    # The "jwt-svid-authenticator" can not be compiled on 1.58.1
+    RUST_BACKTRACE=1 cargo +1.58.1 check --release --features=all-providers,direct-authenticator,unix-peer-credentials-authenticator
 
     # Latest stable
     rustup toolchain install stable
@@ -452,7 +452,7 @@ else
         # We first create the keys
         RUST_BACKTRACE=1 cargo test $TEST_FEATURES --manifest-path ./e2e_tests/Cargo.toml before_tpm_reset
         stop_service
-        
+
         reset_tpm
 
         # We then spin up the service again and check that the keys can still be used