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220bc466 - is_http_range_requests_unsupported should return true on Method Not Allowed (#1713)

is_http_range_requests_unsupported should return true on Method Not Allowed (#1713) ## Summary Azure Artifacts does not allow HEAD requests when attempting to download packages. This expands error handling in `is_http_range_requests_unsupported` to identify HTTP 405 (Method Not Allowed) error codes, and return `true` (i.e. Range requests will not be supported). This partially addresses #1458 – after this change, Azure Artifacts downloads still fail, but due to 401 Not Authorized instead of 405 Method Not Allowed. ## Test Plan I ran something akin to ``` RUST_LOG=trace cargo run -- pip install --index-url=https://REDACTED:REDACTED@pkgs.dev.azure.com/REDACTED/_packaging/REDACTED/pypi/simple/ --upgrade --verbose private-package ``` without this code, and got a 405 failure: ``` error: Failed to download: private-package==1.2.3 Caused by: HTTP status client error (405 Method Not Allowed) for url (https://pkgs.dev.azure.com/REDACTED/_packaging/REDACTED/pypi/download/private-package/1.2.3/private_package-1.2.3-py3-none-any.whl#sha256=REDACTED) ``` with this code, I get a 401 failure: ``` error: Failed to download: private-package==1.2.3 Caused by: HTTP status client error (401 Unauthorized) for url (https://pkgs.dev.azure.com/REDACTED/_packaging/REDACTED/pypi/download/private-package/1.2.3/private_package-1.2.3-py3-none-any.whl#sha256=REDACTED) ``` ## Caveats I'm not seeing a non HEAD request being reported as being fired, so I'm not sure I'm doing this correctly!