Update charted to 0.4.8 and roll

packages/source_span/CHANGELOG.md

+# 1.4.0
+
+* The `new SourceFile()` constructor is deprecated. This constructed a source
+  file from a string's runes, rather than its code units, which runs counter to
+  the way Dart handles strings otherwise. The `new StringFile.fromString()`
+  constructor (see below) should be used instead.
+
+* The `new SourceFile.fromString()` constructor was added. This works like `new
+  SourceFile()`, except it uses code units rather than runes.
+
+* The current behavior when characters larger than `0xFFFF` are passed to `new
+  SourceFile.decoded()` is now considered deprecated.
+
+# 1.3.1
+
+* Properly highlight spans for lines that include tabs with
+  `SourceSpan.highlight()` and `SourceSpan.message()`.
+
+# 1.3.0
+
+* Add `SourceSpan.highlight()`, which returns just the highlighted text that
+  would be included in `SourceSpan.message()`.
+
+# 1.2.4
+
+* Fix a new strong mode error.
+
+# 1.2.3
+
+* Fix a bug where a point span at the end of a file without a trailing newline
+  would be printed incorrectly.
+
+# 1.2.2
+
+* Allow `SourceSpanException.message`, `SourceSpanFormatException.source`, and
+  `SourceSpanWithContext.context` to be overridden in strong mode.
+
 # 1.2.1
 
 * Fix the declared type of `FileSpan.start` and `FileSpan.end`. In 1.2.0 these
   were mistakenly changed from `FileLocation` to `SourceLocation`.
 
 # 1.2.0
 
 * **Deprecated:** Extending `SourceLocation` directly is deprecated. Instead,
   extend the new `SourceLocationBase` class or mix in the new
   `SourceLocationMixin` mixin.
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   `SourceSpan.message` and `SourceFile.message`, respectively. Rather than
   taking both a `useColor` and a `color` parameter, they now take a single
   `color` parameter that controls both whether and which color is used.
 
 * `Span.isIdentifier` has been removed. This property doesn't make sense outside
   of a source map context.
 
 * `SourceFileSegment` has been removed. This class wasn't widely used and was
   inconsistent in its choice of which parameters were considered relative and
   which absolute.