fix(ci): remove weekly MSRV release run

ci/release-matrix.json

@@ -1,6 +1,5 @@
 {
   "schema": 1,
-  "msrv": "1.96.0",
   "current": "stable",
   "native_prerequisites": [
     {
@@ -35,26 +34,6 @@
     "Proprietary services, credentials, and redistributable platform packages are never inferred or downloaded by the matrix."
   ],
   "profiles": [
-    {
-      "id": "linux-msrv-portable",
-      "platform": "linux",
-      "host": "ubuntu-latest",
-      "execution": "native",
-      "toolchain": "1.96.0",
-      "target": "x86_64-unknown-linux-gnu",
-      "feature_sets": ["no-default-features", "rust-j2k", "rust-skia"],
-      "prerequisites": ["libopus-1.3"],
-      "commands": [
-        {
-          "label": "Compile the portable public crates on the declared MSRV",
-          "args": ["check", "--locked", "-j", "1", "--all-targets", "--no-default-features", "--features", "libremetaverse-imaging/rust-j2k,libremetaverse-imaging-skia/rust-skia", "-p", "libremetaverse-types", "-p", "libremetaverse-structured-data", "-p", "libremetaverse-imaging", "-p", "libremetaverse-imaging-skia", "-p", "libremetaverse-prim-mesher", "-p", "libremetaverse-lsl-tools", "-p", "libremetaverse-rlv", "-p", "metacrate-ci-matrix"]
-        },
-        {
-          "label": "Compile the safe native Opus boundary and WebRTC voice on the declared MSRV",
-          "args": ["check", "--locked", "-j", "1", "--all-targets", "--no-default-features", "-p", "libremetaverse-opus", "-p", "libremetaverse-voice-webrtc"]
-        }
-      ]
-    },
     {
       "id": "linux-stable-default",
       "platform": "linux",