Update libgit2

.github/workflows/ci.yaml

@@ -133,19 +133,6 @@ jobs:
       - name: cargo publish
         run: cargo publish --dry-run
 
-  msrv-check:
-    name: Minimum Stable Rust Version Check
-    runs-on: ubuntu-20.04
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: "1.56.1"
-          override: true
-      - run: cargo fetch
-      - name: cargo check
-        run: cargo check --all-targets
-
   release:
     name: Release
     #needs: [test, self, doc-book]

Cargo.toml

@@ -15,6 +15,7 @@ homepage = "https://github.com/EmbarkStudios/cargo-deny"
 categories = ["development-tools::cargo-plugins"]
 keywords = ["cargo", "license", "spdx", "ci", "advisories"]
 exclude = ["examples/", ".github/"]
+rust-version = "1.60.0"
 
 [badges]
 maintenance = { status = "actively-developed" }