use latest sccache, bump nix flake lock, cache everything in rust-cache

Signed-off-by: strawberry <strawberry@puppygock.gay>

flake.lock

@@ -117,11 +117,11 @@
     },
     "crane_2": {
       "locked": {
-        "lastModified": 1733688869,
-        "narHash": "sha256-KrhxxFj1CjESDrL5+u/zsVH0K+Ik9tvoac/oFPoxSB8=",
+        "lastModified": 1734808813,
+        "narHash": "sha256-3aH/0Y6ajIlfy7j52FGZ+s4icVX0oHhqBzRdlOeztqg=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "604637106e420ad99907cae401e13ab6b452e7d9",
+        "rev": "72e2d02dbac80c8c86bf6bf3e785536acf8ee926",
         "type": "github"
       },
       "original": {
@@ -170,11 +170,11 @@
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1733726208,
-        "narHash": "sha256-Z6zL4AtpZWxkvTd3l0KkPZamu2wtTKl4nNiqNSlgsb4=",
+        "lastModified": 1735799625,
+        "narHash": "sha256-lFadwWDvVIub11bwfZhsh2WUByf9LOi6yjsSUMmE0xk=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "d51a64e1d23e509f28a6955a6652cc62409dd4a8",
+        "rev": "a9d84a1545814910cb4ab0515ed6921e8b07ee95",
         "type": "github"
       },
       "original": {
@@ -550,11 +550,11 @@
     },
     "nixpkgs_5": {
       "locked": {
-        "lastModified": 1733656523,
-        "narHash": "sha256-w0FXPfpGhOihoJDiwMsyN1EzpsXi2F8VQ+NVZQSMtys=",
+        "lastModified": 1735685343,
+        "narHash": "sha256-h1CpBzdJDNtSUb5QMyfFHKHocTTky+4McgQEBQBM+xA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "93dc9803a1ee435e590b02cde9589038d5cc3a4e",
+        "rev": "81934660d6e9ea54d2f0cdee821e8533b10c221a",
         "type": "github"
       },
       "original": {
@@ -599,11 +599,11 @@
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1733642337,
-        "narHash": "sha256-I1uc97f/cNhOpCemIbBAUS+CV0R7jts0NW9lc8jrpxc=",
+        "lastModified": 1735742096,
+        "narHash": "sha256-q3a80h8Jf8wfmPURUgRR46nQCB3I5fhZ+/swulTF5HY=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "4c755e62a617eeeef3066994731ce1cdd16504ac",
+        "rev": "7e639ee3dda6ed9cecc79d41f6d38235121e483d",
         "type": "github"
       },
       "original": {