Switch MSRV CI to 1.86

Author: sdroege

.github/workflows/CI.yml

@@ -18,7 +18,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - "1.83.0"
+          - "1.86.0"
         conf:
           - { name: "cairo", features: "png,pdf,svg,ps,use_glib,v1_18,freetype,script,xcb,xlib,win32-surface", nightly: "--features 'png,pdf,svg,ps,use_glib,v1_18,freetype,script,xcb,xlib,win32-surface'", test_sys: true }
           - { name: "gdk-pixbuf", features: "v2_42", nightly: "--all-features", test_sys: true }
@@ -104,7 +104,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - "1.83.0"
+          - "1.86.0"
     steps:
       - uses: actions/checkout@v5
       - uses: actions-rs/toolchain@v1